SMTP Problem

  • Thread starter Thread starter Mike S
  • Start date Start date
M

Mike S

I am in the process of setting up a new exchange server 2003 and seem to
be having a problem sending mail to yahoo users at the moment. At first
I thought it was that my PTR record had not propagated, but now I it has
and I am bouncing mail to yahoo. Below is the error I am getting right
now. I can send to my domain from yahoo accounts, but not the other way
around.


Final-Recipient: rfc822;[email protected]
Action: delayed
Status: 4.4.7
Will-Retry-Until: Wed, 8 Jun 2005 12:49:33 -0400

Any help would be greatly appreciated,
Mike
 
I am in the process of setting up a new exchange server 2003 and seem to
be having a problem sending mail to yahoo users at the moment. At first
I thought it was that my PTR record had not propagated, but now I it has
and I am bouncing mail to yahoo. Below is the error I am getting right
now. I can send to my domain from yahoo accounts, but not the other way
around.
Click to expand...
<snippage>

Not sure if it's a DNS problem, but you may try the following;
first of all disable EDNS0 on your DNS server

http://support.microsoft.com./kb/q828263/

next, ensure that TCP DNS queries are working through your
firewall, to do so, fire up a command prompt and enter the
following commands

nslookup
server 4.2.2.2
set vc
set type=MX
yahoo.com

if the above works you should see a list of the yahoo.com
mail exchangers, the "set vc" above tells nslookup to use
TCP instead of UDP for the query and since we're querying
an external DNS (4.2.2.2) if the above works then your firewall
isn't blocking TCP DNS queries, if it doesn't work, revise your
firewall config to allow DNS queries over TCP and not only
over UDP

At this point, reset the spool queue of the SMTP and retry
sending some messages to a yahoo account

Let me/us (the group) know

Regards

--

* ObiWan

Microsoft MVP: Windows Server - Networking
http://www.microsoft.com/communities/MVP/MVP.mspx
http://italy.mvps.org

DNS "fail-safe" for Windows clients.
http://www.ntcanuck.com

Newsgroups and forums
news://news.ntcanuck.com
http://forums.ntcanuck.com

408+ XP/2000 tweaks and tips
http://www.ntcanuck.com/tq/Tip_Quarry.htm
 
first of all disable EDNS0 on your DNS server
http://support.microsoft.com./kb/q828263/
Click to expand...

Almost forgot, sorry; this link may be useful too

http://www.micahvaline.com/blog/archives/2004/12/edns0_windows_s.html

Regards

--

* ObiWan

Microsoft MVP: Windows Server - Networking
http://www.microsoft.com/communities/MVP/MVP.mspx
http://italy.mvps.org

DNS "fail-safe" for Windows clients.
http://www.ntcanuck.com

Newsgroups and forums
news://news.ntcanuck.com
http://forums.ntcanuck.com

408+ XP/2000 tweaks and tips
http://www.ntcanuck.com/tq/Tip_Quarry.htm
 
Brilliant!!

I ran a few tests to some yahoo accounts and everything went through
fine. I also received all of the other test messages that were in the
queue from earlier this morning.

Thank you!
 
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