Exchange Message Delivery Issue? SMTP

Users that are trying to email us externally are getting bounces.

Exchange 2003, Windows 2003

If i stop and start the SMTP service it fixes the problem, but obviously that is not a solution.

The bounce message the user is getting is:

451 4.4.1 reply: read error from dc3.*******.com.
<****@*******.com>... Deferred: Connection reset by dc3.*******.com.
HADDADD3Asked:
Who is Participating?
 
OctInvCommented:
I would look on any GFI forums (unless anyone here is experienced with GFI). I have never used the software but I do know some people who have had major issues like this with GFI mail products. Sorry to be so vague, but I would have a look at GFI, at the very least to rule it out. Does GFI have seperate log files at all?
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ChopperCenturyCommented:
Are you routing through a smarthost? The SMTP service restarts can sometimes be a sign of DNS issues.
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HADDADD3Author Commented:
No... the service is not restarting itself. It is getting "stuck" and a manual stop/start fixes the issue and allows mail to be delivered again...
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ChopperCenturyCommented:
Yes, I understand you are starting and stopping manually. This is a quick way to get DNS to retry. Do you see any events in the logs?
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HADDADD3Author Commented:
No events in the logs... Just to clarify its an issue with people sending email into us. I'm not sure if it effects outbound emails. No reports of that yet.
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OctInvCommented:
Have you got any anti-spam/AV software somewhere in the chain?
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ChopperCenturyCommented:
How many domains are getting the bounce message from your exchange server? When you restart the SMTP virtual server do the messages immediately deliver to your users?
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HADDADD3Author Commented:
I'm not sure if the "backlogged" messages get delivered when it restarts.

When it restarts the sending mail server is probably retrying to send the message, and on the retry it goes through.

We do have GFI spam / AV software.
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