Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I have an exchange 2003 email server that outgoing emails do not appear to be going out.

The emails get as far as the email queue and don't get any further.

I am getting lots of messages like the following:

Message delivery to the host '' failed while delivering to the remote domain '' for the following reason: The remote server did not respond to a connection attempt.

This leading me to think it might be something to do with my DNS settings, as my exchange server is also acting as a domain controller.

Incoming emails are working fine and the servers internet connetion is working fine.

share|improve this question
Can you resolve the MX records of any of the remote domains from the Exchange server? It would appear so from the info in your post but it's best to verify that. Can you establish a telnet session to port 25 on any of the remote email servers from the Exchange server? – joeqwerty Oct 19 '10 at 12:31

Just to add some value. To get the MX record(s) for a domain:

set type=MX


Default Server: <your DNS>
Address: <your DNS IP>

> set type=MX
Server: <your DNS>
Address: <your DNS IP>

Non-authoritative answer: MX preference = 10, mail exchanger = MX preference = 5, mail exchanger = internet address = internet address =

share|improve this answer

A are you certain that that company/entity is properly configured? Can you contact them otherwise? (i.e. call them) Can you telnet to their MX record?

If your other name resolution-related activities are working, I'd be loathe to say that your DNS is broken. If you can send mail to other outside entities without issue, chances are that that organization has something broken...

share|improve this answer

As Joeqwerty asks, can you telnet to the destination IP address on port 25? If you can't telnet on port 25 to any hosts, then it would suggest a possible firewall issue at your end?

Also, does your server resolve to the correct IP address - maybe do an nslookup against the mx of the destination and compare the address against the same lookup on This should tell you if its the DNS at fault or not.

Couple of other things to take into consideration:

  • Do you use a smarthost for routing, or just use dns (i assume as per your comments, that you use dns).
  • Did this ever work?
  • Check your servers internet address against blacklists (again -

Best of luck

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.