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Exchange not accepting mail from external sources

Posted on 2007-11-23
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Last Modified: 2008-02-01
Hi,
We've recently begun switching from using a 3rd party hosted POP3 service for our email to using our internal Exchange 2003 R2 server. We have a TrendNET firewall that is forwarding port 25 to our server. We have also modified the MX record to point to our static IP at our office.

What's odd is that a DNS report from DNSstuff.com shows that the mail server is allowing a connection test and shows the custom SMTP response banner I created as a test. However, when I telnet to our IP on port 25, it never connects. I downloaded and ran PortQry.exe (MS article 310298) and it shows the server as listening.

There's definitely an issue somewhere as email is not being accepted. Sending email from the Exchange box works, but is strangely slow.

Any hints would be appreciated.

Thanks!
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Question by:IT
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Sembee earned 2000 total points
ID: 20340388
The lack of connection on telnet is classic AV software behaviour. Some AV software will block port 25 on the client machine. McAfee Enterprise does I know, and I think a few others will as well - some versions of Symantec's excuse for an AV perhaps?

I would also suggest that you check that AV is not scanning any of the Exchange directory structure, particularly the logs, database and the mailroot area. That can cause problems with email delivery.

Simon.
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Author Comment

by:IT
ID: 20340451
Hi Simon,
I now received a test message from an external user (my personal Yahoo account) after adding my Internet domain (in addition to my .local internal domain) to the default recipient policy.

Still odd that I can't telnet to port 25 though. I'll have to monitor further to see if more emails start coming into the Exchange box. This was a recent change and I'm not confident that it's totally resolved yet.

-Ed
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Author Comment

by:IT
ID: 20344509
Well, even though telnet isn't allowing me to get to port 25, it appears that the Exchange box is receiving emails Now to fix OWA accessibility from the Internet (internally works). That's another EE search.  :)

Thanks for the help on a holiday weekend Simon!

-Ed
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Expert Comment

by:Sembee
ID: 20344565
Holiday weekend? May be for you, not for me it isn't. Not everyone on here is in the USA, I am in the UK - our next holiday is Christmas.

Simon.
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Author Comment

by:IT
ID: 20443098
Hehe, well I assumed wrong.....I don't celebrate any of the holidays anyway, so I barely keep up on the dates here in the states.
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