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

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.
cembiIT Asked:
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Simon Butler (Sembee)ConsultantCommented:
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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Simon Butler (Sembee)ConsultantCommented:
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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cembiIT Author Commented:
Message archived by Intelligent Message Filtering. How to fix this?
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Simon Butler (Sembee)ConsultantCommented:
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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cembiIT Author Commented:
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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Simon Butler (Sembee)ConsultantCommented:
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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cembiIT Author Commented:
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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