SENDING MAIL TO A SMTP NONSTANDARD PORT

  • Thread starter Thread starter Jesus Merino
  • Start date Start date
J

Jesus Merino

Hi,

We have an Exchange 2K server running fine; now we want to route "some"
incoming eMails to another SMTP server who is listening in a non-standard
port 25. What I have to do?? Perhaps I have to modify my MX record in our
DNS server?? Or I have to modify something in the services file??

Any idea??
 
JM> now we want to route "some" incoming eMails to another
JM> SMTP server [...]

If your definition of "some" involves distinguishing amongst messages using
any criterion apart from the domain portion of the recipient mailbox names,
then this is not a task that one can perform by altering one's DNS service.
Define "some" for us.
 
Incidentally,

JM> a non-standard port 25

is ambiguous because it is self-contradictory.

If this means "an unusual type of SMTP Relay service listening on port 25"
then that's one thing. But if it means "an SMTP Relay srver listening on some
other port, not port 25", then you are asking the impossible. There is no way
to do what you say you want to do.
 
We have an Exchange 2K server running fine; now we want to route "some"
incoming eMails to another SMTP server who is listening in a non-standard
port 25. What I have to do?? Perhaps I have to modify my MX record in our
DNS server?? Or I have to modify something in the services file??
Click to expand...


No, there is no support for PORTS in the MX record, nor do any (known?)
SMTP clients or servers use SRV records.

You must instruct the clients (not always possible) to ALWAYS use the
alternate
port or you must reflect through a NAT like ICS/NAT etc.
 
In
Jesus Merino said:
Hi,

We have an Exchange 2K server running fine; now we want to route
"some" incoming eMails to another SMTP server who is listening in a
non-standard port 25. What I have to do?? Perhaps I have to modify my
MX record in our DNS server?? Or I have to modify something in the
services file??

Any idea??
Click to expand...
You can't do this with DNS or an MX, other mail servers will always use port
25. If you have two IP's on the router you can use NAT to redirect incoming
25 to another port.
 
This is an Exchange question.

To send mail SPECIFICALLY to another server using a port other than default,
you would have to create another SMTP Virtual Server in the System manager
and specify the port and also specify to send mail to that other server with
it's address space. FOr more information, I would post this to the Exchange
groups. DNS has nothing to do with ports in this respect.

--
Regards,
Ace

Please direct all replies to the newsgroup so all can benefit.
This posting is provided "AS IS" with no warranties.

Ace Fekay, MCSE 2000, MCSE+I, MCSA, MCT, MVP
Microsoft Windows MVP - Active Directory
 
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