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?

[Product update] Infrastructure Analysis Tool is now available with Business Accounts.Learn More

x
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

ChopperCenturyCommented:
Are you routing through a smarthost? The SMTP service restarts can sometimes be a sign of DNS issues.
0
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...
0
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?
0
Big Business Goals? Which KPIs Will Help You

The most successful MSPs rely on metrics – known as key performance indicators (KPIs) – for making informed decisions that help their businesses thrive, rather than just survive. This eBook provides an overview of the most important KPIs used by top MSPs.

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.
0
OctInvCommented:
Have you got any anti-spam/AV software somewhere in the chain?
0
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?
0
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.
0
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?
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Exchange

From novice to tech pro — start learning today.