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Strange issues with receiving emails from a particular sender in Exchange 2003

Posted on 2012-09-17
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Last Modified: 2012-09-19
I have an Exchange 2003 SP2 serving about 100 mailboxes. Recently someone from a different company tries to email to someone in the organization. The message disappears and the sender doesn't get an error message. It is not blocked by SPAM either. The sender has been added to the Safe Senders list in ESM. Checking the logs I can see that the message makes it to my Exchange but it is nowhere to be found.
Strangely, if this sender replies to an email sent from someone in my Exchange it makes it just fine without any issues. Same thing if he tries to forward someone else's message. The issue occurs only with new messages.
Thoughts?

Thank you.
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Question by:cembi
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LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 38407028
WHat does message tracking actually say that Exchange is doing with the message? That is key. If you are seeing it in SMTP logs being delivered, then you need to look at what happens afterwards.

Simon.
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Author Comment

by:cembi
ID: 38407392
Message archived by Intelligent Message Filtering. How to fix this?
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Expert Comment

by:Simon Butler (Sembee)
ID: 38407478
IMF is therefore flagging the message as spam.
The archive can be viewed and the messages restored to the queue.

Loads of tools to do that for you. This is the one I use most:
http://hellomate.typepad.com/exchange/2004/06/imf_archive_man.html

I have others listed on my web site here:
http://exchange.sembee.info/2003/smtp/imf.asp

Simon.
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Author Comment

by:cembi
ID: 38407570
Ok, but how do I prevent this from happening again? I thought by adding the user to safe senders list it wouldn't be flagged again.
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LVL 63

Expert Comment

by:Simon Butler (Sembee)
ID: 38408829
This is being flagged by Exchange 2003 IMF. It is only in Exchange 2007 and higher that the safe senders list has any effect on the server based anti-spam tools. You can try adjusting the values of the filtering service, but IMF on Exchange 2003 is very basic and has no white list capability. Therefore you will have to either invest in a tool to manage it - there are a nubmer available, disable IMF completely and use a third party product, or check the archive frequestly for legitiamte messages that can be released.

Simon.
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Author Comment

by:cembi
ID: 38409821
Would you suggest a tool that helps with managing this?

Would we see issues if IMF is turned off? We use Postini for antimalware.
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Simon Butler (Sembee) earned 1400 total points
ID: 38412632
If you are using Postini already, then you can turn off IMF. IMF is a very basic implementation, which only gets updated definitions once a month now.

Simon.
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