Repost - MVP Needed Please - MailMessage and Authentication

[Justin James]

Hello -

I am seeing some truly odd behavior when trying to authenticate against an
SMTP server using the System.Net.MailMessage object to send email. In a
nutshell, the SMTPClient object is sending this double CRLF pattern before
receiving the responses to previous commands, and then immediately plowing
ahead with "AUTH login...". What ends up happening is that it then gets the
response from the double CRLF, which is not the result it expected for the
"AUTH login..." (despite eventually getting the right response, the Base64
encoded request for a password) and blows up.

Manually replaying this precise conversation via telnet to port 25 reveals
that the SMTP server is taking 1 - 2 seconds to respond to each command, so
what I need is a way to slow down the SMTPClient object's sending of commands.

Below is the trace from ASP.Net (I obscurbed some ASCII & Hex Codes for
security).

Any suggestions?

Thanks in advance!

J.Ja

System.Net Information: 0 : [2112]
HeaderCollection#2808346::Set(Content-Transfer-Encoding=base64)
System.Net Information: 0 : [2112] Associating MailMessage#14333193 with
Message#13009416
System.Net Information: 0 : [2112] Associating MailMessage#41728762 with
Message#2174563
System.Net Information: 0 : [2112] Associating Message#2174563 with
HeaderCollection#63062333
System.Net Information: 0 : [2112]
HeaderCollection#63062333::Add(Content-type=text/plain; format=flowed;
delsp=yes; charset="UTF-8")
System.Net Verbose: 0 : [2112] SmtpClient::.ctor()
System.Net Information: 0 : [2112] Associating SmtpClient#16868352 with
SmtpTransport#19420176
System.Net Verbose: 0 : [2112] Exiting SmtpClient::.ctor() ->
SmtpClient#16868352
System.Net Verbose: 0 : [2112] SmtpClient#16868352::Send(MailMessage#41728762)
System.Net Information: 0 : [2112]
SmtpClient#16868352::Send(DeliveryMethod=Network)
System.Net Information: 0 : [2112] Associating SmtpClient#16868352 with
MailMessage#41728762
System.Net Information: 0 : [2112] Associating SmtpTransport#19420176 with
SmtpConnection#26314214
System.Net Information: 0 : [2112] Associating SmtpConnection#26314214 with
ServicePoint#24914721
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Socket(InterNetwork#2)
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Socket()
System.Net.Sockets Verbose: 0 : [2112]
Socket#51438283::Connect(77:25#1305788104)
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Connect()
System.Net Information: 0 : [2112] Associating SmtpConnection#26314214 with
SmtpPooledStream#15315213
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 32 32 30 20 61 74 6C 61-6E
74 65 63 68 2E 6E 65 : 220 XYZ.ne
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 74 20 45 53 4D 54 50 20-53
65 72 76 65 72 20 72 : t ESMTP Server r
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 65 61 64 79 0D 0A
: eady..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 38#38
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 45 48 4C 4F 20 6C 6A 77-65
62 32 0D 0A : EHLO abc..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
13#13
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 32 35 30 2D 61 74 6C 61-6E
74 65 63 68 2E 6E 65 : 250-XYZ.ne
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 74 20 64 6F 6D 61 69 6E-20
6E 61 6D 65 20 73 68 : t domain name sh
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 6F 75 6C 64 20 62 65 20-71
75 61 6C 69 66 69 65 : ould be qualifie
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 64 20 6C 6A 77 65 62 32-0D
0A 32 35 30 2D 44 53 : d ljweb2..250-DS
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 4E 0D 0A 32 35 30 2D 53-49
5A 45 20 31 32 35 38 : N..250-SIZE 1258
System.Net.Sockets Verbose: 0 : [2112] 00000050 : 32 39 31 32 0D 0A 32 35-30
2D 53 54 41 52 54 54 : 2912..250-STARTT
System.Net.Sockets Verbose: 0 : [2112] 00000060 : 4C 53 0D 0A 32 35 30 2D-41
55 54 48 20 4C 4F 47 : LS..250-AUTH LOG
System.Net.Sockets Verbose: 0 : [2112] 00000070 : 49 4E 20 50 4C 41 49 4E-20
43 52 41 4D 2D 4D 44 : IN PLAIN CRAM-MD
System.Net.Sockets Verbose: 0 : [2112] 00000080 : 35 20 44 49 47 45 53 54-2D
4D 44 35 20 47 53 53 : 5 DIGEST-MD5 GSS
System.Net.Sockets Verbose: 0 : [2112] 00000090 : 41 50 49 20 4D 53 4E 20-4E
54 4C 4D 0D 0A 32 35 : API MSN NTLM..25
System.Net.Sockets Verbose: 0 : [2112] 000000A0 : 30 2D 45 54 52 4E 0D 0A-32
35 30 2D 54 55 52 4E : 0-ETRN..250-TURN
System.Net.Sockets Verbose: 0 : [2112] 000000B0 : 0D 0A 32 35 30 2D 41 54-52
4E 0D 0A 32 35 30 2D : ..250-ATRN..250-
System.Net.Sockets Verbose: 0 : [2112] 000000C0 : 4E 4F 2D 53 4F 4C 49 43-49
54 49 4E 47 0D 0A 32 : NO-SOLICITING..2
System.Net.Sockets Verbose: 0 : [2112] 000000D0 : 35 30 2D 38 42 49 54 4D-49
4D 45 0D 0A 32 35 30 : 50-8BITMIME..250
System.Net.Sockets Verbose: 0 : [2112] 000000E0 : 2D 48 45 4C 50 0D 0A 32-35
30 2D 50 49 50 45 4C : -HELP..250-PIPEL
System.Net.Sockets Verbose: 0 : [2112] 000000F0 : 49 4E 49 4E 47 0D 0A 32-35
30 20 45 48 4C 4F 0D : INING..250 EHLO.
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 256#256
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 0A
: .
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 1#1
System.Net Verbose: 0 : [2112]
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net Information: 0 : [2112] Enumerating security packages:
System.Net Information: 0 : [2112] Negotiate
System.Net Information: 0 : [2112] Kerberos
System.Net Information: 0 : [2112] NTLM
System.Net Information: 0 : [2112] Schannel
System.Net Information: 0 : [2112] Microsoft Unified Security Protocol
Provider
System.Net Information: 0 : [2112] WDigest
System.Net Information: 0 : [2112] DPA
System.Net Information: 0 : [2112] Digest
System.Net Information: 0 : [2112] MSN
System.Net Information: 0 : [2112] AcquireCredentialsHandle(package =
Negotiate, intent = Outbound, authdata = (string.empty)\[email protected])
System.Net Information: 0 : [2112] InitializeSecurityContext(credential =
System.Net.SafeFreeCredential_SECURITY, context = (null), targetName = ,
inFlags = Connection, InitIntegrity)
System.Net Information: 0 : [2112] InitializeSecurityContext(In-Buffer
length=0, Out-Buffer length=40, returned code=ContinueNeeded).
System.Net Verbose: 0 : [2112] Exiting
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 41 55 54 48 20 67 73 73-61
70 69 20 54 6C 52 4D : AUTH gssapi TlRM
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 54 56 4E 54 55 41 41 42-41
41 41 41 6C 34 49 49 : TVNTUAABAAAAl4II
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 34 67 41 41 41 41 41 41-41
41 41 41 41 41 41 41 : 4gAAAAAAAAAAAAAA
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 41 41 41 41 41 41 41 46-41
73 34 4F 41 41 41 41 : AAAAAAAFAs4OAAAA
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 44 77 3D 3D 0D 0A
: Dw==..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
70#70
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 33 33 34 20 54 6C 52 4D-54
56 4E 54 55 41 41 43 : 334 TlRMTVNTUAAC
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 41 41 41 41 41 41 41 41-41
44 41 41 41 41 43 44 : AAAAAAAAADAAAACD
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 41 68 42 41 51 30 59 78-4E
44 49 30 51 6A 51 41 : AhBAQ0YxNDI0QjQA
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 41 41 41 41 41 41 41 41-41
41 41 41 41 41 41 41 : AAAAAAAAAAAAAAAA
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 41 41 41 41 0D 0A
: AAAA..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 70#70
System.Net Verbose: 0 : [2112]
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net Information: 0 : [2112] InitializeSecurityContext(credential =
System.Net.SafeFreeCredential_SECURITY, context = 22ed78:1f178cc8, targetName
= , inFlags = Connection, InitIntegrity)
System.Net Information: 0 : [2112] InitializeSecurityContext(In-Buffer
length=48, Out-Buffer length=12128, returned code=Unsupported).
System.Net Verbose: 0 : [2112] Exiting
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 0D 0A 0D 0A
: ....
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() -> 4#4
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 35 33 35 20 47 53 53 41-50
49 20 4E 54 4C 4D 20 : 535 GSSAPI NTLM
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 66 6F 72 6D 61 74 20 65-72
72 6F 72 0D 0A : format error..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 30#30
System.Net Verbose: 0 : [2112]
SmtpLoginAuthenticationModule#62301924::Authenticate()
System.Net Verbose: 0 : [2112] Exiting
SmtpLoginAuthenticationModule#62301924::Authenticate()
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 41 55 54 48 20 6C 6F 67-69
6E 20 63 32 68 76 63 : AUTH login c2hvc
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 77 77 73 5A 77 5A 70 77-47
70 68 62 77 56 7A 4C : EAAAAAAAAAAAAVzL
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 6D 4E 77 62 51 3D 3D 0D-0A
: mNvbQ==..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
41#41
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 35 30 31 20 55 6E 6B 6E-6F
77 6E 20 63 6F 6D 6D : 501 Unknown comm
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 61 6E 64 0D 0A
: and..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 21#21
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 4D 41 49 4C 20 46 52 4F-4D
3A 3C 73 68 6F 70 40 : MAIL FROM:<shop@
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 6C 65 77 77 77 77 77 77-77
73 2E 63 6F 6D 3E 0D : abc.com>.
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 0A
: .
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
33#33
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 33 33 34 20 55 47 46 7A-63
33 64 76 63 6D 51 36 : 334 UGFzc3dvcmQ6
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 0D 0A
: ..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 18#18
System.Net Error: 0 : [2112] Exception in the SmtpClient#16868352::Send -
The server committed a protocol violation The server response was:
UGFzc3dvcmQ6
System.Net Error: 0 : [2112] at
System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String
response)
at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command,
String from)
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender,
MailAddressCollection recipients, String deliveryNotify,
SmtpFailedRecipientException& exception)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283:ispose()
System.Net Verbose: 0 : [2112] Exiting SmtpClient#16868352::Send()

 

[Alvin Bruney [ASP.NET MVP]]

Can you create a short but complete program that demonstrates the problem?
Don't know what short but complete is? see this link:
http://www.yoda.arachsys.com/csharp/complete.html


--

Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The O.W.C. Black Book, 2nd Edition
Exclusively on www.lulu.com/owc $19.99
-------------------------------------------------------

Hello -

I am seeing some truly odd behavior when trying to authenticate against an
SMTP server using the System.Net.MailMessage object to send email. In a
nutshell, the SMTPClient object is sending this double CRLF pattern before
receiving the responses to previous commands, and then immediately plowing
ahead with "AUTH login...". What ends up happening is that it then gets
the
response from the double CRLF, which is not the result it expected for the
"AUTH login..." (despite eventually getting the right response, the Base64
encoded request for a password) and blows up.

Manually replaying this precise conversation via telnet to port 25 reveals
that the SMTP server is taking 1 - 2 seconds to respond to each command,
so
what I need is a way to slow down the SMTPClient object's sending of
commands.

Below is the trace from ASP.Net (I obscurbed some ASCII & Hex Codes for
security).

Any suggestions?

Thanks in advance!

J.Ja

System.Net Information: 0 : [2112]
HeaderCollection#2808346::Set(Content-Transfer-Encoding=base64)
System.Net Information: 0 : [2112] Associating MailMessage#14333193 with
Message#13009416
System.Net Information: 0 : [2112] Associating MailMessage#41728762 with
Message#2174563
System.Net Information: 0 : [2112] Associating Message#2174563 with
HeaderCollection#63062333
System.Net Information: 0 : [2112]
HeaderCollection#63062333::Add(Content-type=text/plain; format=flowed;
delsp=yes; charset="UTF-8")
System.Net Verbose: 0 : [2112] SmtpClient::.ctor()
System.Net Information: 0 : [2112] Associating SmtpClient#16868352 with
SmtpTransport#19420176
System.Net Verbose: 0 : [2112] Exiting SmtpClient::.ctor() ->
SmtpClient#16868352
System.Net Verbose: 0 : [2112]
SmtpClient#16868352::Send(MailMessage#41728762)
System.Net Information: 0 : [2112]
SmtpClient#16868352::Send(DeliveryMethod=Network)
System.Net Information: 0 : [2112] Associating SmtpClient#16868352 with
MailMessage#41728762
System.Net Information: 0 : [2112] Associating SmtpTransport#19420176 with
SmtpConnection#26314214
System.Net Information: 0 : [2112] Associating SmtpConnection#26314214
with
ServicePoint#24914721
System.Net.Sockets Verbose: 0 : [2112]
Socket#51438283::Socket(InterNetwork#2)
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Socket()
System.Net.Sockets Verbose: 0 : [2112]
Socket#51438283::Connect(77:25#1305788104)
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Connect()
System.Net Information: 0 : [2112] Associating SmtpConnection#26314214
with
SmtpPooledStream#15315213
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 32 32 30 20 61 74 6C
61-6E
74 65 63 68 2E 6E 65 : 220 XYZ.ne
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 74 20 45 53 4D 54 50
20-53
65 72 76 65 72 20 72 : t ESMTP Server r
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 65 61 64 79 0D 0A
: eady..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 38#38
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 45 48 4C 4F 20 6C 6A
77-65
62 32 0D 0A : EHLO abc..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
13#13
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 32 35 30 2D 61 74 6C
61-6E
74 65 63 68 2E 6E 65 : 250-XYZ.ne
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 74 20 64 6F 6D 61 69
6E-20
6E 61 6D 65 20 73 68 : t domain name sh
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 6F 75 6C 64 20 62 65
20-71
75 61 6C 69 66 69 65 : ould be qualifie
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 64 20 6C 6A 77 65 62
32-0D
0A 32 35 30 2D 44 53 : d ljweb2..250-DS
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 4E 0D 0A 32 35 30 2D
53-49
5A 45 20 31 32 35 38 : N..250-SIZE 1258
System.Net.Sockets Verbose: 0 : [2112] 00000050 : 32 39 31 32 0D 0A 32
35-30
2D 53 54 41 52 54 54 : 2912..250-STARTT
System.Net.Sockets Verbose: 0 : [2112] 00000060 : 4C 53 0D 0A 32 35 30
2D-41
55 54 48 20 4C 4F 47 : LS..250-AUTH LOG
System.Net.Sockets Verbose: 0 : [2112] 00000070 : 49 4E 20 50 4C 41 49
4E-20
43 52 41 4D 2D 4D 44 : IN PLAIN CRAM-MD
System.Net.Sockets Verbose: 0 : [2112] 00000080 : 35 20 44 49 47 45 53
54-2D
4D 44 35 20 47 53 53 : 5 DIGEST-MD5 GSS
System.Net.Sockets Verbose: 0 : [2112] 00000090 : 41 50 49 20 4D 53 4E
20-4E
54 4C 4D 0D 0A 32 35 : API MSN NTLM..25
System.Net.Sockets Verbose: 0 : [2112] 000000A0 : 30 2D 45 54 52 4E 0D
0A-32
35 30 2D 54 55 52 4E : 0-ETRN..250-TURN
System.Net.Sockets Verbose: 0 : [2112] 000000B0 : 0D 0A 32 35 30 2D 41
54-52
4E 0D 0A 32 35 30 2D : ..250-ATRN..250-
System.Net.Sockets Verbose: 0 : [2112] 000000C0 : 4E 4F 2D 53 4F 4C 49
43-49
54 49 4E 47 0D 0A 32 : NO-SOLICITING..2
System.Net.Sockets Verbose: 0 : [2112] 000000D0 : 35 30 2D 38 42 49 54
4D-49
4D 45 0D 0A 32 35 30 : 50-8BITMIME..250
System.Net.Sockets Verbose: 0 : [2112] 000000E0 : 2D 48 45 4C 50 0D 0A
32-35
30 2D 50 49 50 45 4C : -HELP..250-PIPEL
System.Net.Sockets Verbose: 0 : [2112] 000000F0 : 49 4E 49 4E 47 0D 0A
32-35
30 20 45 48 4C 4F 0D : INING..250 EHLO.
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 256#256
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 0A
: .
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 1#1
System.Net Verbose: 0 : [2112]
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net Information: 0 : [2112] Enumerating security packages:
System.Net Information: 0 : [2112] Negotiate
System.Net Information: 0 : [2112] Kerberos
System.Net Information: 0 : [2112] NTLM
System.Net Information: 0 : [2112] Schannel
System.Net Information: 0 : [2112] Microsoft Unified Security Protocol
Provider
System.Net Information: 0 : [2112] WDigest
System.Net Information: 0 : [2112] DPA
System.Net Information: 0 : [2112] Digest
System.Net Information: 0 : [2112] MSN
System.Net Information: 0 : [2112] AcquireCredentialsHandle(package =
Negotiate, intent = Outbound, authdata = (string.empty)\[email protected])
System.Net Information: 0 : [2112] InitializeSecurityContext(credential =
System.Net.SafeFreeCredential_SECURITY, context = (null), targetName = ,
inFlags = Connection, InitIntegrity)
System.Net Information: 0 : [2112] InitializeSecurityContext(In-Buffer
length=0, Out-Buffer length=40, returned code=ContinueNeeded).
System.Net Verbose: 0 : [2112] Exiting
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 41 55 54 48 20 67 73
73-61
70 69 20 54 6C 52 4D : AUTH gssapi TlRM
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 54 56 4E 54 55 41 41
42-41
41 41 41 6C 34 49 49 : TVNTUAABAAAAl4II
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 34 67 41 41 41 41 41
41-41
41 41 41 41 41 41 41 : 4gAAAAAAAAAAAAAA
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 41 41 41 41 41 41 41
46-41
73 34 4F 41 41 41 41 : AAAAAAAFAs4OAAAA
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 44 77 3D 3D 0D 0A
: Dw==..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
70#70
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 33 33 34 20 54 6C 52
4D-54
56 4E 54 55 41 41 43 : 334 TlRMTVNTUAAC
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 41 41 41 41 41 41 41
41-41
44 41 41 41 41 43 44 : AAAAAAAAADAAAACD
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 41 68 42 41 51 30 59
78-4E
44 49 30 51 6A 51 41 : AhBAQ0YxNDI0QjQA
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 41 41 41 41 41 41 41
41-41
41 41 41 41 41 41 41 : AAAAAAAAAAAAAAAA
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 41 41 41 41 0D 0A
: AAAA..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 70#70
System.Net Verbose: 0 : [2112]
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net Information: 0 : [2112] InitializeSecurityContext(credential =
System.Net.SafeFreeCredential_SECURITY, context = 22ed78:1f178cc8,
targetName
= , inFlags = Connection, InitIntegrity)
System.Net Information: 0 : [2112] InitializeSecurityContext(In-Buffer
length=48, Out-Buffer length=12128, returned code=Unsupported).
System.Net Verbose: 0 : [2112] Exiting
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 0D 0A 0D 0A
: ....
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
4#4
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 35 33 35 20 47 53 53
41-50
49 20 4E 54 4C 4D 20 : 535 GSSAPI NTLM
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 66 6F 72 6D 61 74 20
65-72
72 6F 72 0D 0A : format error..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 30#30
System.Net Verbose: 0 : [2112]
SmtpLoginAuthenticationModule#62301924::Authenticate()
System.Net Verbose: 0 : [2112] Exiting
SmtpLoginAuthenticationModule#62301924::Authenticate()
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 41 55 54 48 20 6C 6F
67-69
6E 20 63 32 68 76 63 : AUTH login c2hvc
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 77 77 73 5A 77 5A 70
77-47
70 68 62 77 56 7A 4C : EAAAAAAAAAAAAVzL
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 6D 4E 77 62 51 3D 3D
0D-0A
: mNvbQ==..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
41#41
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 35 30 31 20 55 6E 6B
6E-6F
77 6E 20 63 6F 6D 6D : 501 Unknown comm
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 61 6E 64 0D 0A
: and..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 21#21
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 4D 41 49 4C 20 46 52
4F-4D
3A 3C 73 68 6F 70 40 : MAIL FROM:<shop@
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 6C 65 77 77 77 77 77
77-77
73 2E 63 6F 6D 3E 0D : abc.com>.
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 0A
: .
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
33#33
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 33 33 34 20 55 47 46
7A-63
33 64 76 63 6D 51 36 : 334 UGFzc3dvcmQ6
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 0D 0A
: ..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 18#18
System.Net Error: 0 : [2112] Exception in the SmtpClient#16868352::Send -
The server committed a protocol violation The server response was:
UGFzc3dvcmQ6
System.Net Error: 0 : [2112] at
System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode,
String
response)
at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command,
String from)
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender,
MailAddressCollection recipients, String deliveryNotify,
SmtpFailedRecipientException& exception)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283:ispose()
System.Net Verbose: 0 : [2112] Exiting SmtpClient#16868352::Send()

 

[Justin James]

Here is the code for a working application. I modified it slightly to account
for it being out of the application that I am developing, but all of the
stuff I removed was related to using default values if none were passed. This
demo application generates precisely the same errors as my real application,
so I know that it properly represents my issue.

Thanks for your help!

J.Ja

using System;
using System.Net;
using System.Net.Mail;

namespace SMTPAuthErrorDemo
{
public class DemoApp
{
public static void SendEmail(MailMessage message, string server, int
port, string username, string password, string encoding, bool useSSL)
{
string contentType = message.IsBodyHtml ? "text/html" :
"text/plain";
// Set enconding
if (encoding != "")
{
message.BodyEncoding =
System.Text.Encoding.GetEncoding(encoding);
message.Headers.Add("Content-type", contentType + @";
format=flowed; delsp=yes; charset=""" + encoding + @"""");
message.SubjectEncoding =
System.Text.Encoding.GetEncoding(encoding);
}
else
{
message.BodyEncoding = System.Text.Encoding.UTF8;
//Content-Type: text/plain; format=flowed; delsp=yes;
charset=iso-8859-15
message.Headers.Add("Content-type", contentType + @";
format=flowed; delsp=yes; charset=""" + encoding + @"""");
message.SubjectEncoding = System.Text.Encoding.UTF8;
}

// Setup the SMTP server
SmtpClient client = new SmtpClient();
if (server != "")
{
client.Host = server;
// Email will be sent over SSL
if (useSSL)
{
client.EnableSsl = true;
}
}
else
{
client.Host = "localhost";
}

// Set credentials
if (username != "")
{
NetworkCredential credentials = new
NetworkCredential(username, password);
client.Credentials = credentials;
}
else
{
client.UseDefaultCredentials = true;
}

// Send email.
client.Send(message);
}

public static void Main(string[] sArguments)
{
MailMessage mmTemp = new MailMessage("(e-mail address removed)",
"(e-mail address removed)", "This is a test email.", "Hey, I am a test email!");

if (sArguments.Length != 6)
{
Console.WriteLine("Usage: SMTPAuthDemo.exe serverip
serverport username password encoding usessl");
}
else
{
try
{
SendEmail(mmTemp, sArguments[0],
Int32.Parse(sArguments[1]), sArguments[2], sArguments[3], sArguments[4],
Boolean.Parse(sArguments[5]));
Console.WriteLine("Send succeded.");
}
catch (Exception ex)
{
Console.WriteLine("Send failed: " + ex.Message);
}
}
}
}
}

Can you create a short but complete program that demonstrates the problem?
Don't know what short but complete is? see this link:
http://www.yoda.arachsys.com/csharp/complete.html


--

Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The O.W.C. Black Book, 2nd Edition
Exclusively on www.lulu.com/owc $19.99
-------------------------------------------------------

Hello -

I am seeing some truly odd behavior when trying to authenticate against an
SMTP server using the System.Net.MailMessage object to send email. In a
nutshell, the SMTPClient object is sending this double CRLF pattern before
receiving the responses to previous commands, and then immediately plowing
ahead with "AUTH login...". What ends up happening is that it then gets
the
response from the double CRLF, which is not the result it expected for the
"AUTH login..." (despite eventually getting the right response, the Base64
encoded request for a password) and blows up.

Manually replaying this precise conversation via telnet to port 25 reveals
that the SMTP server is taking 1 - 2 seconds to respond to each command,
so
what I need is a way to slow down the SMTPClient object's sending of
commands.

Below is the trace from ASP.Net (I obscurbed some ASCII & Hex Codes for
security).

Any suggestions?

Thanks in advance!

J.Ja

System.Net Information: 0 : [2112]
HeaderCollection#2808346::Set(Content-Transfer-Encoding=base64)
System.Net Information: 0 : [2112] Associating MailMessage#14333193 with
Message#13009416
System.Net Information: 0 : [2112] Associating MailMessage#41728762 with
Message#2174563
System.Net Information: 0 : [2112] Associating Message#2174563 with
HeaderCollection#63062333
System.Net Information: 0 : [2112]
HeaderCollection#63062333::Add(Content-type=text/plain; format=flowed;
delsp=yes; charset="UTF-8")
System.Net Verbose: 0 : [2112] SmtpClient::.ctor()
System.Net Information: 0 : [2112] Associating SmtpClient#16868352 with
SmtpTransport#19420176
System.Net Verbose: 0 : [2112] Exiting SmtpClient::.ctor() ->
SmtpClient#16868352
System.Net Verbose: 0 : [2112]
SmtpClient#16868352::Send(MailMessage#41728762)
System.Net Information: 0 : [2112]
SmtpClient#16868352::Send(DeliveryMethod=Network)
System.Net Information: 0 : [2112] Associating SmtpClient#16868352 with
MailMessage#41728762
System.Net Information: 0 : [2112] Associating SmtpTransport#19420176 with
SmtpConnection#26314214
System.Net Information: 0 : [2112] Associating SmtpConnection#26314214
with
ServicePoint#24914721
System.Net.Sockets Verbose: 0 : [2112]
Socket#51438283::Socket(InterNetwork#2)
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Socket()
System.Net.Sockets Verbose: 0 : [2112]
Socket#51438283::Connect(77:25#1305788104)
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Connect()
System.Net Information: 0 : [2112] Associating SmtpConnection#26314214
with
SmtpPooledStream#15315213
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 32 32 30 20 61 74 6C
61-6E
74 65 63 68 2E 6E 65 : 220 XYZ.ne
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 74 20 45 53 4D 54 50
20-53
65 72 76 65 72 20 72 : t ESMTP Server r
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 65 61 64 79 0D 0A
: eady..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 38#38
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 45 48 4C 4F 20 6C 6A
77-65
62 32 0D 0A : EHLO abc..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
13#13
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 32 35 30 2D 61 74 6C
61-6E
74 65 63 68 2E 6E 65 : 250-XYZ.ne
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 74 20 64 6F 6D 61 69
6E-20
6E 61 6D 65 20 73 68 : t domain name sh
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 6F 75 6C 64 20 62 65
20-71
75 61 6C 69 66 69 65 : ould be qualifie
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 64 20 6C 6A 77 65 62
32-0D
0A 32 35 30 2D 44 53 : d ljweb2..250-DS
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 4E 0D 0A 32 35 30 2D
53-49
5A 45 20 31 32 35 38 : N..250-SIZE 1258
System.Net.Sockets Verbose: 0 : [2112] 00000050 : 32 39 31 32 0D 0A 32
35-30
2D 53 54 41 52 54 54 : 2912..250-STARTT
System.Net.Sockets Verbose: 0 : [2112] 00000060 : 4C 53 0D 0A 32 35 30
2D-41
55 54 48 20 4C 4F 47 : LS..250-AUTH LOG
System.Net.Sockets Verbose: 0 : [2112] 00000070 : 49 4E 20 50 4C 41 49
4E-20
43 52 41 4D 2D 4D 44 : IN PLAIN CRAM-MD
System.Net.Sockets Verbose: 0 : [2112] 00000080 : 35 20 44 49 47 45 53
54-2D
4D 44 35 20 47 53 53 : 5 DIGEST-MD5 GSS
System.Net.Sockets Verbose: 0 : [2112] 00000090 : 41 50 49 20 4D 53 4E
20-4E
54 4C 4D 0D 0A 32 35 : API MSN NTLM..25
System.Net.Sockets Verbose: 0 : [2112] 000000A0 : 30 2D 45 54 52 4E 0D
0A-32
35 30 2D 54 55 52 4E : 0-ETRN..250-TURN
System.Net.Sockets Verbose: 0 : [2112] 000000B0 : 0D 0A 32 35 30 2D 41
54-52
4E 0D 0A 32 35 30 2D : ..250-ATRN..250-
System.Net.Sockets Verbose: 0 : [2112] 000000C0 : 4E 4F 2D 53 4F 4C 49
43-49
54 49 4E 47 0D 0A 32 : NO-SOLICITING..2
System.Net.Sockets Verbose: 0 : [2112] 000000D0 : 35 30 2D 38 42 49 54
4D-49
4D 45 0D 0A 32 35 30 : 50-8BITMIME..250
System.Net.Sockets Verbose: 0 : [2112] 000000E0 : 2D 48 45 4C 50 0D 0A
32-35
30 2D 50 49 50 45 4C : -HELP..250-PIPEL
System.Net.Sockets Verbose: 0 : [2112] 000000F0 : 49 4E 49 4E 47 0D 0A
32-35
30 20 45 48 4C 4F 0D : INING..250 EHLO.
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 256#256
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 0A
: .
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 1#1
System.Net Verbose: 0 : [2112]
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net Information: 0 : [2112] Enumerating security packages:
System.Net Information: 0 : [2112] Negotiate
System.Net Information: 0 : [2112] Kerberos
System.Net Information: 0 : [2112] NTLM
System.Net Information: 0 : [2112] Schannel
System.Net Information: 0 : [2112] Microsoft Unified Security Protocol
Provider
System.Net Information: 0 : [2112] WDigest
System.Net Information: 0 : [2112] DPA
System.Net Information: 0 : [2112] Digest
System.Net Information: 0 : [2112] MSN
System.Net Information: 0 : [2112] AcquireCredentialsHandle(package =
Negotiate, intent = Outbound, authdata = (string.empty)\[email protected])
System.Net Information: 0 : [2112] InitializeSecurityContext(credential =
System.Net.SafeFreeCredential_SECURITY, context = (null), targetName = ,
inFlags = Connection, InitIntegrity)
System.Net Information: 0 : [2112] InitializeSecurityContext(In-Buffer
length=0, Out-Buffer length=40, returned code=ContinueNeeded).
System.Net Verbose: 0 : [2112] Exiting
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 41 55 54 48 20 67 73
73-61
70 69 20 54 6C 52 4D : AUTH gssapi TlRM
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 54 56 4E 54 55 41 41
42-41
41 41 41 6C 34 49 49 : TVNTUAABAAAAl4II
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 34 67 41 41 41 41 41
41-41
41 41 41 41 41 41 41 : 4gAAAAAAAAAAAAAA
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 41 41 41 41 41 41 41
46-41
73 34 4F 41 41 41 41 : AAAAAAAFAs4OAAAA
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 44 77 3D 3D 0D 0A
: Dw==..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
70#70
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 33 33 34 20 54 6C 52
4D-54
56 4E 54 55 41 41 43 : 334 TlRMTVNTUAAC
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 41 41 41 41 41 41 41
41-41
44 41 41 41 41 43 44 : AAAAAAAAADAAAACD
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 41 68 42 41 51 30 59
78-4E
44 49 30 51 6A 51 41 : AhBAQ0YxNDI0QjQA
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 41 41 41 41 41 41 41
41-41
41 41 41 41 41 41 41 : AAAAAAAAAAAAAAAA
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 41 41 41 41 0D 0A
: AAAA..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 70#70
System.Net Verbose: 0 : [2112]
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net Information: 0 : [2112] InitializeSecurityContext(credential =
System.Net.SafeFreeCredential_SECURITY, context = 22ed78:1f178cc8,
targetName
= , inFlags = Connection, InitIntegrity)
System.Net Information: 0 : [2112] InitializeSecurityContext(In-Buffer
length=48, Out-Buffer length=12128, returned code=Unsupported).
System.Net Verbose: 0 : [2112] Exiting
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 0D 0A 0D 0A
: ....
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
4#4
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 35 33 35 20 47 53 53
41-50
49 20 4E 54 4C 4D 20 : 535 GSSAPI NTLM
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 66 6F 72 6D 61 74 20
65-72
72 6F 72 0D 0A : format error..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 30#30
System.Net Verbose: 0 : [2112]
SmtpLoginAuthenticationModule#62301924::Authenticate()
System.Net Verbose: 0 : [2112] Exiting
SmtpLoginAuthenticationModule#62301924::Authenticate()
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 41 55 54 48 20 6C 6F
67-69
6E 20 63 32 68 76 63 : AUTH login c2hvc
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 77 77 73 5A 77 5A 70
77-47
70 68 62 77 56 7A 4C : EAAAAAAAAAAAAVzL
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 6D 4E 77 62 51 3D 3D
0D-0A
: mNvbQ==..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
41#41
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 35 30 31 20 55 6E 6B
6E-6F
77 6E 20 63 6F 6D 6D : 501 Unknown comm
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 61 6E 64 0D 0A
: and..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 21#21
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 4D 41 49 4C 20 46 52
4F-4D
3A 3C 73 68 6F 70 40 : MAIL FROM:<shop@
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 6C 65 77 77 77 77 77
77-77
73 2E 63 6F 6D 3E 0D : abc.com>.
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 0A
: .
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Send() ->
33#33
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 33 33 34 20 55 47 46
7A-63
33 64 76 63 6D 51 36 : 334 UGFzc3dvcmQ6
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 0D 0A
: ..
System.Net.Sockets Verbose: 0 : [2112] Exiting Socket#51438283::Receive()
-> 18#18
System.Net Error: 0 : [2112] Exception in the SmtpClient#16868352::Send -
The server committed a protocol violation The server response was:
UGFzc3dvcmQ6
System.Net Error: 0 : [2112] at
System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode,
String
response)
at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command,
String from)
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender,

 

[Alvin Bruney [ASP.NET MVP]]

send your email address to vapordan at hot mail dot com with a copy of the
code. I'll open a support incident with Microsoft on your behalf.

--

Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The O.W.C. Black Book, 2nd Edition
Exclusively on www.lulu.com/owc $19.99
-------------------------------------------------------

Here is the code for a working application. I modified it slightly to
account
for it being out of the application that I am developing, but all of the
stuff I removed was related to using default values if none were passed.
This
demo application generates precisely the same errors as my real
application,
so I know that it properly represents my issue.

Thanks for your help!

J.Ja

using System;
using System.Net;
using System.Net.Mail;

namespace SMTPAuthErrorDemo
{
public class DemoApp
{
public static void SendEmail(MailMessage message, string server,
int
port, string username, string password, string encoding, bool useSSL)
{
string contentType = message.IsBodyHtml ? "text/html" :
"text/plain";
// Set enconding
if (encoding != "")
{
message.BodyEncoding =
System.Text.Encoding.GetEncoding(encoding);
message.Headers.Add("Content-type", contentType + @";
format=flowed; delsp=yes; charset=""" + encoding + @"""");
message.SubjectEncoding =
System.Text.Encoding.GetEncoding(encoding);
}
else
{
message.BodyEncoding = System.Text.Encoding.UTF8;
//Content-Type: text/plain; format=flowed; delsp=yes;
charset=iso-8859-15
message.Headers.Add("Content-type", contentType + @";
format=flowed; delsp=yes; charset=""" + encoding + @"""");
message.SubjectEncoding = System.Text.Encoding.UTF8;
}

// Setup the SMTP server
SmtpClient client = new SmtpClient();
if (server != "")
{
client.Host = server;
// Email will be sent over SSL
if (useSSL)
{
client.EnableSsl = true;
}
}
else
{
client.Host = "localhost";
}

// Set credentials
if (username != "")
{
NetworkCredential credentials = new
NetworkCredential(username, password);
client.Credentials = credentials;
}
else
{
client.UseDefaultCredentials = true;
}

// Send email.
client.Send(message);
}

public static void Main(string[] sArguments)
{
MailMessage mmTemp = new MailMessage("(e-mail address removed)",
"(e-mail address removed)", "This is a test email.", "Hey, I am a test email!");

if (sArguments.Length != 6)
{
Console.WriteLine("Usage: SMTPAuthDemo.exe serverip
serverport username password encoding usessl");
}
else
{
try
{
SendEmail(mmTemp, sArguments[0],
Int32.Parse(sArguments[1]), sArguments[2], sArguments[3], sArguments[4],
Boolean.Parse(sArguments[5]));
Console.WriteLine("Send succeded.");
}
catch (Exception ex)
{
Console.WriteLine("Send failed: " + ex.Message);
}
}
}
}
}

Can you create a short but complete program that demonstrates the
problem?
Don't know what short but complete is? see this link:
http://www.yoda.arachsys.com/csharp/complete.html


--

Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The O.W.C. Black Book, 2nd Edition
Exclusively on www.lulu.com/owc $19.99
-------------------------------------------------------

Hello -

I am seeing some truly odd behavior when trying to authenticate against
an
SMTP server using the System.Net.MailMessage object to send email. In a
nutshell, the SMTPClient object is sending this double CRLF pattern
before
receiving the responses to previous commands, and then immediately
plowing
ahead with "AUTH login...". What ends up happening is that it then gets
the
response from the double CRLF, which is not the result it expected for
the
"AUTH login..." (despite eventually getting the right response, the
Base64
encoded request for a password) and blows up.

Manually replaying this precise conversation via telnet to port 25
reveals
that the SMTP server is taking 1 - 2 seconds to respond to each
command,
so
what I need is a way to slow down the SMTPClient object's sending of
commands.

Below is the trace from ASP.Net (I obscurbed some ASCII & Hex Codes for
security).

Any suggestions?

Thanks in advance!

J.Ja

System.Net Information: 0 : [2112]
HeaderCollection#2808346::Set(Content-Transfer-Encoding=base64)
System.Net Information: 0 : [2112] Associating MailMessage#14333193
with
Message#13009416
System.Net Information: 0 : [2112] Associating MailMessage#41728762
with
Message#2174563
System.Net Information: 0 : [2112] Associating Message#2174563 with
HeaderCollection#63062333
System.Net Information: 0 : [2112]
HeaderCollection#63062333::Add(Content-type=text/plain; format=flowed;
delsp=yes; charset="UTF-8")
System.Net Verbose: 0 : [2112] SmtpClient::.ctor()
System.Net Information: 0 : [2112] Associating SmtpClient#16868352 with
SmtpTransport#19420176
System.Net Verbose: 0 : [2112] Exiting SmtpClient::.ctor() ->
SmtpClient#16868352
System.Net Verbose: 0 : [2112]
SmtpClient#16868352::Send(MailMessage#41728762)
System.Net Information: 0 : [2112]
SmtpClient#16868352::Send(DeliveryMethod=Network)
System.Net Information: 0 : [2112] Associating SmtpClient#16868352 with
MailMessage#41728762
System.Net Information: 0 : [2112] Associating SmtpTransport#19420176
with
SmtpConnection#26314214
System.Net Information: 0 : [2112] Associating SmtpConnection#26314214
with
ServicePoint#24914721
System.Net.Sockets Verbose: 0 : [2112]
Socket#51438283::Socket(InterNetwork#2)
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Socket()
System.Net.Sockets Verbose: 0 : [2112]
Socket#51438283::Connect(77:25#1305788104)
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Connect()
System.Net Information: 0 : [2112] Associating SmtpConnection#26314214
with
SmtpPooledStream#15315213
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 32 32 30 20 61 74 6C
61-6E
74 65 63 68 2E 6E 65 : 220 XYZ.ne
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 74 20 45 53 4D 54 50
20-53
65 72 76 65 72 20 72 : t ESMTP Server r
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 65 61 64 79 0D 0A
: eady..
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Receive()
-> 38#38
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 45 48 4C 4F 20 6C 6A
77-65
62 32 0D 0A : EHLO abc..
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Send() ->
13#13
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 32 35 30 2D 61 74 6C
61-6E
74 65 63 68 2E 6E 65 : 250-XYZ.ne
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 74 20 64 6F 6D 61 69
6E-20
6E 61 6D 65 20 73 68 : t domain name sh
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 6F 75 6C 64 20 62 65
20-71
75 61 6C 69 66 69 65 : ould be qualifie
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 64 20 6C 6A 77 65 62
32-0D
0A 32 35 30 2D 44 53 : d ljweb2..250-DS
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 4E 0D 0A 32 35 30 2D
53-49
5A 45 20 31 32 35 38 : N..250-SIZE 1258
System.Net.Sockets Verbose: 0 : [2112] 00000050 : 32 39 31 32 0D 0A 32
35-30
2D 53 54 41 52 54 54 : 2912..250-STARTT
System.Net.Sockets Verbose: 0 : [2112] 00000060 : 4C 53 0D 0A 32 35 30
2D-41
55 54 48 20 4C 4F 47 : LS..250-AUTH LOG
System.Net.Sockets Verbose: 0 : [2112] 00000070 : 49 4E 20 50 4C 41 49
4E-20
43 52 41 4D 2D 4D 44 : IN PLAIN CRAM-MD
System.Net.Sockets Verbose: 0 : [2112] 00000080 : 35 20 44 49 47 45 53
54-2D
4D 44 35 20 47 53 53 : 5 DIGEST-MD5 GSS
System.Net.Sockets Verbose: 0 : [2112] 00000090 : 41 50 49 20 4D 53 4E
20-4E
54 4C 4D 0D 0A 32 35 : API MSN NTLM..25
System.Net.Sockets Verbose: 0 : [2112] 000000A0 : 30 2D 45 54 52 4E 0D
0A-32
35 30 2D 54 55 52 4E : 0-ETRN..250-TURN
System.Net.Sockets Verbose: 0 : [2112] 000000B0 : 0D 0A 32 35 30 2D 41
54-52
4E 0D 0A 32 35 30 2D : ..250-ATRN..250-
System.Net.Sockets Verbose: 0 : [2112] 000000C0 : 4E 4F 2D 53 4F 4C 49
43-49
54 49 4E 47 0D 0A 32 : NO-SOLICITING..2
System.Net.Sockets Verbose: 0 : [2112] 000000D0 : 35 30 2D 38 42 49 54
4D-49
4D 45 0D 0A 32 35 30 : 50-8BITMIME..250
System.Net.Sockets Verbose: 0 : [2112] 000000E0 : 2D 48 45 4C 50 0D 0A
32-35
30 2D 50 49 50 45 4C : -HELP..250-PIPEL
System.Net.Sockets Verbose: 0 : [2112] 000000F0 : 49 4E 49 4E 47 0D 0A
32-35
30 20 45 48 4C 4F 0D : INING..250 EHLO.
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Receive()
-> 256#256
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 0A
: .
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Receive()
-> 1#1
System.Net Verbose: 0 : [2112]
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net Information: 0 : [2112] Enumerating security packages:
System.Net Information: 0 : [2112] Negotiate
System.Net Information: 0 : [2112] Kerberos
System.Net Information: 0 : [2112] NTLM
System.Net Information: 0 : [2112] Schannel
System.Net Information: 0 : [2112] Microsoft Unified Security
Protocol
Provider
System.Net Information: 0 : [2112] WDigest
System.Net Information: 0 : [2112] DPA
System.Net Information: 0 : [2112] Digest
System.Net Information: 0 : [2112] MSN
System.Net Information: 0 : [2112] AcquireCredentialsHandle(package =
Negotiate, intent = Outbound, authdata = (string.empty)\[email protected])
System.Net Information: 0 : [2112] InitializeSecurityContext(credential
=
System.Net.SafeFreeCredential_SECURITY, context = (null), targetName =
,
inFlags = Connection, InitIntegrity)
System.Net Information: 0 : [2112] InitializeSecurityContext(In-Buffer
length=0, Out-Buffer length=40, returned code=ContinueNeeded).
System.Net Verbose: 0 : [2112] Exiting
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 41 55 54 48 20 67 73
73-61
70 69 20 54 6C 52 4D : AUTH gssapi TlRM
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 54 56 4E 54 55 41 41
42-41
41 41 41 6C 34 49 49 : TVNTUAABAAAAl4II
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 34 67 41 41 41 41 41
41-41
41 41 41 41 41 41 41 : 4gAAAAAAAAAAAAAA
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 41 41 41 41 41 41 41
46-41
73 34 4F 41 41 41 41 : AAAAAAAFAs4OAAAA
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 44 77 3D 3D 0D 0A
: Dw==..
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Send() ->
70#70
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 33 33 34 20 54 6C 52
4D-54
56 4E 54 55 41 41 43 : 334 TlRMTVNTUAAC
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 41 41 41 41 41 41 41
41-41
44 41 41 41 41 43 44 : AAAAAAAAADAAAACD
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 41 68 42 41 51 30 59
78-4E
44 49 30 51 6A 51 41 : AhBAQ0YxNDI0QjQA
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 41 41 41 41 41 41 41
41-41
41 41 41 41 41 41 41 : AAAAAAAAAAAAAAAA
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 41 41 41 41 0D 0A
: AAAA..
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Receive()
-> 70#70
System.Net Verbose: 0 : [2112]
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net Information: 0 : [2112] InitializeSecurityContext(credential
=
System.Net.SafeFreeCredential_SECURITY, context = 22ed78:1f178cc8,
targetName
= , inFlags = Connection, InitIntegrity)
System.Net Information: 0 : [2112] InitializeSecurityContext(In-Buffer
length=48, Out-Buffer length=12128, returned code=Unsupported).
System.Net Verbose: 0 : [2112] Exiting
SmtpNegotiateAuthenticationModule#41488021::Authenticate()
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 0D 0A 0D 0A
: ....
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Send() ->
4#4
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 35 33 35 20 47 53 53
41-50
49 20 4E 54 4C 4D 20 : 535 GSSAPI NTLM
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 66 6F 72 6D 61 74 20
65-72
72 6F 72 0D 0A : format error..
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Receive()
-> 30#30
System.Net Verbose: 0 : [2112]
SmtpLoginAuthenticationModule#62301924::Authenticate()
System.Net Verbose: 0 : [2112] Exiting
SmtpLoginAuthenticationModule#62301924::Authenticate()
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 41 55 54 48 20 6C 6F
67-69
6E 20 63 32 68 76 63 : AUTH login c2hvc
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 77 77 73 5A 77 5A 70
77-47
70 68 62 77 56 7A 4C : EAAAAAAAAAAAAVzL
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 6D 4E 77 62 51 3D 3D
0D-0A
: mNvbQ==..
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Send() ->
41#41
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 35 30 31 20 55 6E 6B
6E-6F
77 6E 20 63 6F 6D 6D : 501 Unknown comm
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 61 6E 64 0D 0A
: and..
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Receive()
-> 21#21
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 4D 41 49 4C 20 46 52
4F-4D
3A 3C 73 68 6F 70 40 : MAIL FROM:<shop@
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 6C 65 77 77 77 77 77
77-77
73 2E 63 6F 6D 3E 0D : abc.com>.
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 0A
: .
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Send() ->
33#33
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 33 33 34 20 55 47 46
7A-63
33 64 76 63 6D 51 36 : 334 UGFzc3dvcmQ6
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 0D 0A
: ..
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Receive()
-> 18#18
System.Net Error: 0 : [2112] Exception in the
SmtpClient#16868352::Send -
The server committed a protocol violation The server response was:
UGFzc3dvcmQ6
System.Net Error: 0 : [2112] at
System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode,
String
response)
at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[]
command,
String from)
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender,

 

[Justin James]

I havre an incident open now, but thanks! I will let you know what the
results are. It is looking quite possible that we have found a problem deeply
rooted in either the OS or the .Net Framework itself, since the problem is
clearly in regards to the authentication protocol negotiation and a
"tarpitting" SMTP server. Right now I did a work around, by added a "toggle"
in the configuration for COM email sending. Because I am using .Net 3.5, the
System.Web.Mail namespace is gone, so I had to use cdosys.dll on its own
without S.W.M. as a wrapper around it, which is causing its own problems.

Thanks again, and I will keep you posted!

J.Ja

send your email address to vapordan at hot mail dot com with a copy of the
code. I'll open a support incident with Microsoft on your behalf.

--

Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The O.W.C. Black Book, 2nd Edition
Exclusively on www.lulu.com/owc $19.99
-------------------------------------------------------

Here is the code for a working application. I modified it slightly to
account
for it being out of the application that I am developing, but all of the
stuff I removed was related to using default values if none were passed.
This
demo application generates precisely the same errors as my real
application,
so I know that it properly represents my issue.

Thanks for your help!

J.Ja

using System;
using System.Net;
using System.Net.Mail;

namespace SMTPAuthErrorDemo
{
public class DemoApp
{
public static void SendEmail(MailMessage message, string server,
int
port, string username, string password, string encoding, bool useSSL)
{
string contentType = message.IsBodyHtml ? "text/html" :
"text/plain";
// Set enconding
if (encoding != "")
{
message.BodyEncoding =
System.Text.Encoding.GetEncoding(encoding);
message.Headers.Add("Content-type", contentType + @";
format=flowed; delsp=yes; charset=""" + encoding + @"""");
message.SubjectEncoding =
System.Text.Encoding.GetEncoding(encoding);
}
else
{
message.BodyEncoding = System.Text.Encoding.UTF8;
//Content-Type: text/plain; format=flowed; delsp=yes;
charset=iso-8859-15
message.Headers.Add("Content-type", contentType + @";
format=flowed; delsp=yes; charset=""" + encoding + @"""");
message.SubjectEncoding = System.Text.Encoding.UTF8;
}

// Setup the SMTP server
SmtpClient client = new SmtpClient();
if (server != "")
{
client.Host = server;
// Email will be sent over SSL
if (useSSL)
{
client.EnableSsl = true;
}
}
else
{
client.Host = "localhost";
}

// Set credentials
if (username != "")
{
NetworkCredential credentials = new
NetworkCredential(username, password);
client.Credentials = credentials;
}
else
{
client.UseDefaultCredentials = true;
}

// Send email.
client.Send(message);
}

public static void Main(string[] sArguments)
{
MailMessage mmTemp = new MailMessage("(e-mail address removed)",
"(e-mail address removed)", "This is a test email.", "Hey, I am a test email!");

if (sArguments.Length != 6)
{
Console.WriteLine("Usage: SMTPAuthDemo.exe serverip
serverport username password encoding usessl");
}
else
{
try
{
SendEmail(mmTemp, sArguments[0],
Int32.Parse(sArguments[1]), sArguments[2], sArguments[3], sArguments[4],
Boolean.Parse(sArguments[5]));
Console.WriteLine("Send succeded.");
}
catch (Exception ex)
{
Console.WriteLine("Send failed: " + ex.Message);
}
}
}
}
}

Can you create a short but complete program that demonstrates the
problem?
Don't know what short but complete is? see this link:
http://www.yoda.arachsys.com/csharp/complete.html


--

Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The O.W.C. Black Book, 2nd Edition
Exclusively on www.lulu.com/owc $19.99
-------------------------------------------------------



Hello -

I am seeing some truly odd behavior when trying to authenticate against
an
SMTP server using the System.Net.MailMessage object to send email. In a
nutshell, the SMTPClient object is sending this double CRLF pattern
before
receiving the responses to previous commands, and then immediately
plowing
ahead with "AUTH login...". What ends up happening is that it then gets
the
response from the double CRLF, which is not the result it expected for
the
"AUTH login..." (despite eventually getting the right response, the
Base64
encoded request for a password) and blows up.

Manually replaying this precise conversation via telnet to port 25
reveals
that the SMTP server is taking 1 - 2 seconds to respond to each
command,
so
what I need is a way to slow down the SMTPClient object's sending of
commands.

Below is the trace from ASP.Net (I obscurbed some ASCII & Hex Codes for
security).

Any suggestions?

Thanks in advance!

J.Ja

System.Net Information: 0 : [2112]
HeaderCollection#2808346::Set(Content-Transfer-Encoding=base64)
System.Net Information: 0 : [2112] Associating MailMessage#14333193
with
Message#13009416
System.Net Information: 0 : [2112] Associating MailMessage#41728762
with
Message#2174563
System.Net Information: 0 : [2112] Associating Message#2174563 with
HeaderCollection#63062333
System.Net Information: 0 : [2112]
HeaderCollection#63062333::Add(Content-type=text/plain; format=flowed;
delsp=yes; charset="UTF-8")
System.Net Verbose: 0 : [2112] SmtpClient::.ctor()
System.Net Information: 0 : [2112] Associating SmtpClient#16868352 with
SmtpTransport#19420176
System.Net Verbose: 0 : [2112] Exiting SmtpClient::.ctor() ->
SmtpClient#16868352
System.Net Verbose: 0 : [2112]
SmtpClient#16868352::Send(MailMessage#41728762)
System.Net Information: 0 : [2112]
SmtpClient#16868352::Send(DeliveryMethod=Network)
System.Net Information: 0 : [2112] Associating SmtpClient#16868352 with
MailMessage#41728762
System.Net Information: 0 : [2112] Associating SmtpTransport#19420176
with
SmtpConnection#26314214
System.Net Information: 0 : [2112] Associating SmtpConnection#26314214
with
ServicePoint#24914721
System.Net.Sockets Verbose: 0 : [2112]
Socket#51438283::Socket(InterNetwork#2)
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Socket()
System.Net.Sockets Verbose: 0 : [2112]
Socket#51438283::Connect(77:25#1305788104)
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Connect()
System.Net Information: 0 : [2112] Associating SmtpConnection#26314214
with
SmtpPooledStream#15315213
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 32 32 30 20 61 74 6C
61-6E
74 65 63 68 2E 6E 65 : 220 XYZ.ne
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 74 20 45 53 4D 54 50
20-53
65 72 76 65 72 20 72 : t ESMTP Server r
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 65 61 64 79 0D 0A
: eady..
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Receive()
-> 38#38
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 45 48 4C 4F 20 6C 6A
77-65
62 32 0D 0A : EHLO abc..
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Send() ->
13#13
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 32 35 30 2D 61 74 6C
61-6E
74 65 63 68 2E 6E 65 : 250-XYZ.ne
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 74 20 64 6F 6D 61 69
6E-20
6E 61 6D 65 20 73 68 : t domain name sh
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 6F 75 6C 64 20 62 65
20-71
75 61 6C 69 66 69 65 : ould be qualifie
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 64 20 6C 6A 77 65 62
32-0D
0A 32 35 30 2D 44 53 : d ljweb2..250-DS
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 4E 0D 0A 32 35 30 2D
53-49
5A 45 20 31 32 35 38 : N..250-SIZE 1258
System.Net.Sockets Verbose: 0 : [2112] 00000050 : 32 39 31 32 0D 0A 32
35-30
2D 53 54 41 52 54 54 : 2912..250-STARTT
System.Net.Sockets Verbose: 0 : [2112] 00000060 : 4C 53 0D 0A 32 35 30
2D-41
55 54 48 20 4C 4F 47 : LS..250-AUTH LOG
System.Net.Sockets Verbose: 0 : [2112] 00000070 : 49 4E 20 50 4C 41 49
4E-20
43 52 41 4D 2D 4D 44 : IN PLAIN CRAM-MD
System.Net.Sockets Verbose: 0 : [2112] 00000080 : 35 20 44 49 47 45 53
54-2D
4D 44 35 20 47 53 53 : 5 DIGEST-MD5 GSS
System.Net.Sockets Verbose: 0 : [2112] 00000090 : 41 50 49 20 4D 53 4E
20-4E
54 4C 4D 0D 0A 32 35 : API MSN NTLM..25
System.Net.Sockets Verbose: 0 : [2112] 000000A0 : 30 2D 45 54 52 4E 0D
0A-32
35 30 2D 54 55 52 4E : 0-ETRN..250-TURN
System.Net.Sockets Verbose: 0 : [2112] 000000B0 : 0D 0A 32 35 30 2D 41
54-52
4E 0D 0A 32 35 30 2D : ..250-ATRN..250-
System.Net.Sockets Verbose: 0 : [2112] 000000C0 : 4E 4F 2D 53 4F 4C 49
43-49
54 49 4E 47 0D 0A 32 : NO-SOLICITING..2
System.Net.Sockets Verbose: 0 : [2112] 000000D0 : 35 30 2D 38 42 49 54
4D-49
4D 45 0D 0A 32 35 30 : 50-8BITMIME..250
System.Net.Sockets Verbose: 0 : [2112] 000000E0 : 2D 48 45 4C 50 0D 0A
32-35
30 2D 50 49 50 45 4C : -HELP..250-PIPEL
System.Net.Sockets Verbose: 0 : [2112] 000000F0 : 49 4E 49 4E 47 0D 0A
32-35
30 20 45 48 4C 4F 0D : INING..250 EHLO.
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Receive()
-> 256#256
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from

 

[Alvin Bruney [ASP.NET MVP]]

Because I am using .Net 3.5, the
System.Web.Mail namespace is gone, so I had to use cdosys.dll on its own

i didn't know that. that worries me deeply. we have several hundred projects
at the enterprise level that work on that. I shudder to think of the
migration nightmare. brrrr.

--

Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The O.W.C. Black Book, 2nd Edition
Exclusively on www.lulu.com/owc $19.99
-------------------------------------------------------

I havre an incident open now, but thanks! I will let you know what the
results are. It is looking quite possible that we have found a problem
deeply
rooted in either the OS or the .Net Framework itself, since the problem is
clearly in regards to the authentication protocol negotiation and a
"tarpitting" SMTP server. Right now I did a work around, by added a
"toggle"
in the configuration for COM email sending. Because I am using .Net 3.5,
the
System.Web.Mail namespace is gone, so I had to use cdosys.dll on its own
without S.W.M. as a wrapper around it, which is causing its own problems.

Thanks again, and I will keep you posted!

J.Ja

send your email address to vapordan at hot mail dot com with a copy of
the
code. I'll open a support incident with Microsoft on your behalf.

--

Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The O.W.C. Black Book, 2nd Edition
Exclusively on www.lulu.com/owc $19.99
-------------------------------------------------------

Here is the code for a working application. I modified it slightly to
account
for it being out of the application that I am developing, but all of
the
stuff I removed was related to using default values if none were
passed.
This
demo application generates precisely the same errors as my real
application,
so I know that it properly represents my issue.

Thanks for your help!

J.Ja

using System;
using System.Net;
using System.Net.Mail;

namespace SMTPAuthErrorDemo
{
public class DemoApp
{
public static void SendEmail(MailMessage message, string server,
int
port, string username, string password, string encoding, bool useSSL)
{
string contentType = message.IsBodyHtml ? "text/html" :
"text/plain";
// Set enconding
if (encoding != "")
{
message.BodyEncoding =
System.Text.Encoding.GetEncoding(encoding);
message.Headers.Add("Content-type", contentType + @";
format=flowed; delsp=yes; charset=""" + encoding + @"""");
message.SubjectEncoding =
System.Text.Encoding.GetEncoding(encoding);
}
else
{
message.BodyEncoding = System.Text.Encoding.UTF8;
//Content-Type: text/plain; format=flowed; delsp=yes;
charset=iso-8859-15
message.Headers.Add("Content-type", contentType + @";
format=flowed; delsp=yes; charset=""" + encoding + @"""");
message.SubjectEncoding = System.Text.Encoding.UTF8;
}

// Setup the SMTP server
SmtpClient client = new SmtpClient();
if (server != "")
{
client.Host = server;
// Email will be sent over SSL
if (useSSL)
{
client.EnableSsl = true;
}
}
else
{
client.Host = "localhost";
}

// Set credentials
if (username != "")
{
NetworkCredential credentials = new
NetworkCredential(username, password);
client.Credentials = credentials;
}
else
{
client.UseDefaultCredentials = true;
}

// Send email.
client.Send(message);
}

public static void Main(string[] sArguments)
{
MailMessage mmTemp = new MailMessage("(e-mail address removed)",
"(e-mail address removed)", "This is a test email.", "Hey, I am a test email!");

if (sArguments.Length != 6)
{
Console.WriteLine("Usage: SMTPAuthDemo.exe serverip
serverport username password encoding usessl");
}
else
{
try
{
SendEmail(mmTemp, sArguments[0],
Int32.Parse(sArguments[1]), sArguments[2], sArguments[3],
sArguments[4],
Boolean.Parse(sArguments[5]));
Console.WriteLine("Send succeded.");
}
catch (Exception ex)
{
Console.WriteLine("Send failed: " + ex.Message);
}
}
}
}
}


:

Can you create a short but complete program that demonstrates the
problem?
Don't know what short but complete is? see this link:
http://www.yoda.arachsys.com/csharp/complete.html


--

Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The O.W.C. Black Book, 2nd Edition
Exclusively on www.lulu.com/owc $19.99
-------------------------------------------------------



message
Hello -

I am seeing some truly odd behavior when trying to authenticate
against
an
SMTP server using the System.Net.MailMessage object to send email.
In a
nutshell, the SMTPClient object is sending this double CRLF pattern
before
receiving the responses to previous commands, and then immediately
plowing
ahead with "AUTH login...". What ends up happening is that it then
gets
the
response from the double CRLF, which is not the result it expected
for
the
"AUTH login..." (despite eventually getting the right response, the
Base64
encoded request for a password) and blows up.

Manually replaying this precise conversation via telnet to port 25
reveals
that the SMTP server is taking 1 - 2 seconds to respond to each
command,
so
what I need is a way to slow down the SMTPClient object's sending of
commands.

Below is the trace from ASP.Net (I obscurbed some ASCII & Hex Codes
for
security).

Any suggestions?

Thanks in advance!

J.Ja

System.Net Information: 0 : [2112]
HeaderCollection#2808346::Set(Content-Transfer-Encoding=base64)
System.Net Information: 0 : [2112] Associating MailMessage#14333193
with
Message#13009416
System.Net Information: 0 : [2112] Associating MailMessage#41728762
with
Message#2174563
System.Net Information: 0 : [2112] Associating Message#2174563 with
HeaderCollection#63062333
System.Net Information: 0 : [2112]
HeaderCollection#63062333::Add(Content-type=text/plain;
format=flowed;
delsp=yes; charset="UTF-8")
System.Net Verbose: 0 : [2112] SmtpClient::.ctor()
System.Net Information: 0 : [2112] Associating SmtpClient#16868352
with
SmtpTransport#19420176
System.Net Verbose: 0 : [2112] Exiting SmtpClient::.ctor() ->
SmtpClient#16868352
System.Net Verbose: 0 : [2112]
SmtpClient#16868352::Send(MailMessage#41728762)
System.Net Information: 0 : [2112]
SmtpClient#16868352::Send(DeliveryMethod=Network)
System.Net Information: 0 : [2112] Associating SmtpClient#16868352
with
MailMessage#41728762
System.Net Information: 0 : [2112] Associating
SmtpTransport#19420176
with
SmtpConnection#26314214
System.Net Information: 0 : [2112] Associating
SmtpConnection#26314214
with
ServicePoint#24914721
System.Net.Sockets Verbose: 0 : [2112]
Socket#51438283::Socket(InterNetwork#2)
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Socket()
System.Net.Sockets Verbose: 0 : [2112]
Socket#51438283::Connect(77:25#1305788104)
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Connect()
System.Net Information: 0 : [2112] Associating
SmtpConnection#26314214
with
SmtpPooledStream#15315213
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 32 32 30 20 61 74
6C
61-6E
74 65 63 68 2E 6E 65 : 220 XYZ.ne
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 74 20 45 53 4D 54
50
20-53
65 72 76 65 72 20 72 : t ESMTP Server r
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 65 61 64 79 0D 0A
: eady..
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Receive()
-> 38#38
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 45 48 4C 4F 20 6C
6A
77-65
62 32 0D 0A : EHLO abc..
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Send() ->
13#13
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 32 35 30 2D 61 74
6C
61-6E
74 65 63 68 2E 6E 65 : 250-XYZ.ne
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 74 20 64 6F 6D 61
69
6E-20
6E 61 6D 65 20 73 68 : t domain name sh
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 6F 75 6C 64 20 62
65
20-71
75 61 6C 69 66 69 65 : ould be qualifie
System.Net.Sockets Verbose: 0 : [2112] 00000030 : 64 20 6C 6A 77 65
62
32-0D
0A 32 35 30 2D 44 53 : d ljweb2..250-DS
System.Net.Sockets Verbose: 0 : [2112] 00000040 : 4E 0D 0A 32 35 30
2D
53-49
5A 45 20 31 32 35 38 : N..250-SIZE 1258
System.Net.Sockets Verbose: 0 : [2112] 00000050 : 32 39 31 32 0D 0A
32
35-30
2D 53 54 41 52 54 54 : 2912..250-STARTT
System.Net.Sockets Verbose: 0 : [2112] 00000060 : 4C 53 0D 0A 32 35
30
2D-41
55 54 48 20 4C 4F 47 : LS..250-AUTH LOG
System.Net.Sockets Verbose: 0 : [2112] 00000070 : 49 4E 20 50 4C 41
49
4E-20
43 52 41 4D 2D 4D 44 : IN PLAIN CRAM-MD
System.Net.Sockets Verbose: 0 : [2112] 00000080 : 35 20 44 49 47 45
53
54-2D
4D 44 35 20 47 53 53 : 5 DIGEST-MD5 GSS
System.Net.Sockets Verbose: 0 : [2112] 00000090 : 41 50 49 20 4D 53
4E
20-4E
54 4C 4D 0D 0A 32 35 : API MSN NTLM..25
System.Net.Sockets Verbose: 0 : [2112] 000000A0 : 30 2D 45 54 52 4E
0D
0A-32
35 30 2D 54 55 52 4E : 0-ETRN..250-TURN
System.Net.Sockets Verbose: 0 : [2112] 000000B0 : 0D 0A 32 35 30 2D
41
54-52
4E 0D 0A 32 35 30 2D : ..250-ATRN..250-
System.Net.Sockets Verbose: 0 : [2112] 000000C0 : 4E 4F 2D 53 4F 4C
49
43-49
54 49 4E 47 0D 0A 32 : NO-SOLICITING..2
System.Net.Sockets Verbose: 0 : [2112] 000000D0 : 35 30 2D 38 42 49
54
4D-49
4D 45 0D 0A 32 35 30 : 50-8BITMIME..250
System.Net.Sockets Verbose: 0 : [2112] 000000E0 : 2D 48 45 4C 50 0D
0A
32-35
30 2D 50 49 50 45 4C : -HELP..250-PIPEL
System.Net.Sockets Verbose: 0 : [2112] 000000F0 : 49 4E 49 4E 47 0D
0A
32-35
30 20 45 48 4C 4F 0D : INING..250 EHLO.
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Receive()
-> 256#256
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from

 

[Justin James]

It turns out that S.W.M. is still there, but it is listed as "obsolete" and
throws warnings out.

At the end of the day, there was a dual failure. The SMTP server is claiming
to support GSSAPI authentication when it does not do it properly, and at the
same time the S.N.M. component does not properly handle that failure. I ended
up adding a "use older COM mailer system" configuration to my project and
implementing this with CDOSYS.DLL, but I would have much rather preferred a
100% .Net solution. Thanks for your help on this!

J.Ja

Because I am using .Net 3.5, the
System.Web.Mail namespace is gone, so I had to use cdosys.dll on its own

i didn't know that. that worries me deeply. we have several hundred projects
at the enterprise level that work on that. I shudder to think of the
migration nightmare. brrrr.

--

Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The O.W.C. Black Book, 2nd Edition
Exclusively on www.lulu.com/owc $19.99
-------------------------------------------------------

I havre an incident open now, but thanks! I will let you know what the
results are. It is looking quite possible that we have found a problem
deeply
rooted in either the OS or the .Net Framework itself, since the problem is
clearly in regards to the authentication protocol negotiation and a
"tarpitting" SMTP server. Right now I did a work around, by added a
"toggle"
in the configuration for COM email sending. Because I am using .Net 3.5,
the
System.Web.Mail namespace is gone, so I had to use cdosys.dll on its own
without S.W.M. as a wrapper around it, which is causing its own problems.

Thanks again, and I will keep you posted!

J.Ja

send your email address to vapordan at hot mail dot com with a copy of
the
code. I'll open a support incident with Microsoft on your behalf.

--

Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The O.W.C. Black Book, 2nd Edition
Exclusively on www.lulu.com/owc $19.99
-------------------------------------------------------



Here is the code for a working application. I modified it slightly to
account
for it being out of the application that I am developing, but all of
the
stuff I removed was related to using default values if none were
passed.
This
demo application generates precisely the same errors as my real
application,
so I know that it properly represents my issue.

Thanks for your help!

J.Ja

using System;
using System.Net;
using System.Net.Mail;

namespace SMTPAuthErrorDemo
{
public class DemoApp
{
public static void SendEmail(MailMessage message, string server,
int
port, string username, string password, string encoding, bool useSSL)
{
string contentType = message.IsBodyHtml ? "text/html" :
"text/plain";
// Set enconding
if (encoding != "")
{
message.BodyEncoding =
System.Text.Encoding.GetEncoding(encoding);
message.Headers.Add("Content-type", contentType + @";
format=flowed; delsp=yes; charset=""" + encoding + @"""");
message.SubjectEncoding =
System.Text.Encoding.GetEncoding(encoding);
}
else
{
message.BodyEncoding = System.Text.Encoding.UTF8;
//Content-Type: text/plain; format=flowed; delsp=yes;
charset=iso-8859-15
message.Headers.Add("Content-type", contentType + @";
format=flowed; delsp=yes; charset=""" + encoding + @"""");
message.SubjectEncoding = System.Text.Encoding.UTF8;
}

// Setup the SMTP server
SmtpClient client = new SmtpClient();
if (server != "")
{
client.Host = server;
// Email will be sent over SSL
if (useSSL)
{
client.EnableSsl = true;
}
}
else
{
client.Host = "localhost";
}

// Set credentials
if (username != "")
{
NetworkCredential credentials = new
NetworkCredential(username, password);
client.Credentials = credentials;
}
else
{
client.UseDefaultCredentials = true;
}

// Send email.
client.Send(message);
}

public static void Main(string[] sArguments)
{
MailMessage mmTemp = new MailMessage("(e-mail address removed)",
"(e-mail address removed)", "This is a test email.", "Hey, I am a test email!");

if (sArguments.Length != 6)
{
Console.WriteLine("Usage: SMTPAuthDemo.exe serverip
serverport username password encoding usessl");
}
else
{
try
{
SendEmail(mmTemp, sArguments[0],
Int32.Parse(sArguments[1]), sArguments[2], sArguments[3],
sArguments[4],
Boolean.Parse(sArguments[5]));
Console.WriteLine("Send succeded.");
}
catch (Exception ex)
{
Console.WriteLine("Send failed: " + ex.Message);
}
}
}
}
}


:

Can you create a short but complete program that demonstrates the
problem?
Don't know what short but complete is? see this link:
http://www.yoda.arachsys.com/csharp/complete.html


--

Regards,
Alvin Bruney [MVP ASP.NET]

[Shameless Author plug]
The O.W.C. Black Book, 2nd Edition
Exclusively on www.lulu.com/owc $19.99
-------------------------------------------------------



message
Hello -

I am seeing some truly odd behavior when trying to authenticate
against
an
SMTP server using the System.Net.MailMessage object to send email.
In a
nutshell, the SMTPClient object is sending this double CRLF pattern
before
receiving the responses to previous commands, and then immediately
plowing
ahead with "AUTH login...". What ends up happening is that it then
gets
the
response from the double CRLF, which is not the result it expected
for
the
"AUTH login..." (despite eventually getting the right response, the
Base64
encoded request for a password) and blows up.

Manually replaying this precise conversation via telnet to port 25
reveals
that the SMTP server is taking 1 - 2 seconds to respond to each
command,
so
what I need is a way to slow down the SMTPClient object's sending of
commands.

Below is the trace from ASP.Net (I obscurbed some ASCII & Hex Codes
for
security).

Any suggestions?

Thanks in advance!

J.Ja

System.Net Information: 0 : [2112]
HeaderCollection#2808346::Set(Content-Transfer-Encoding=base64)
System.Net Information: 0 : [2112] Associating MailMessage#14333193
with
Message#13009416
System.Net Information: 0 : [2112] Associating MailMessage#41728762
with
Message#2174563
System.Net Information: 0 : [2112] Associating Message#2174563 with
HeaderCollection#63062333
System.Net Information: 0 : [2112]
HeaderCollection#63062333::Add(Content-type=text/plain;
format=flowed;
delsp=yes; charset="UTF-8")
System.Net Verbose: 0 : [2112] SmtpClient::.ctor()
System.Net Information: 0 : [2112] Associating SmtpClient#16868352
with
SmtpTransport#19420176
System.Net Verbose: 0 : [2112] Exiting SmtpClient::.ctor() ->
SmtpClient#16868352
System.Net Verbose: 0 : [2112]
SmtpClient#16868352::Send(MailMessage#41728762)
System.Net Information: 0 : [2112]
SmtpClient#16868352::Send(DeliveryMethod=Network)
System.Net Information: 0 : [2112] Associating SmtpClient#16868352
with
MailMessage#41728762
System.Net Information: 0 : [2112] Associating
SmtpTransport#19420176
with
SmtpConnection#26314214
System.Net Information: 0 : [2112] Associating
SmtpConnection#26314214
with
ServicePoint#24914721
System.Net.Sockets Verbose: 0 : [2112]
Socket#51438283::Socket(InterNetwork#2)
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Socket()
System.Net.Sockets Verbose: 0 : [2112]
Socket#51438283::Connect(77:25#1305788104)
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Connect()
System.Net Information: 0 : [2112] Associating
SmtpConnection#26314214
with
SmtpPooledStream#15315213
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Receive()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Receive
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 32 32 30 20 61 74
6C
61-6E
74 65 63 68 2E 6E 65 : 220 XYZ.ne
System.Net.Sockets Verbose: 0 : [2112] 00000010 : 74 20 45 53 4D 54
50
20-53
65 72 76 65 72 20 72 : t ESMTP Server r
System.Net.Sockets Verbose: 0 : [2112] 00000020 : 65 61 64 79 0D 0A
: eady..
System.Net.Sockets Verbose: 0 : [2112] Exiting
Socket#51438283::Receive()
-> 38#38
System.Net.Sockets Verbose: 0 : [2112] Socket#51438283::Send()
System.Net.Sockets Verbose: 0 : [2112] Data from
Socket#51438283::Send
System.Net.Sockets Verbose: 0 : [2112] 00000000 : 45 48 4C 4F 20 6C
6A
77-65
62 32 0D 0A : EHLO abc..