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I don't know if you are referring to the Exchange POP3 Virtual Server or a third-party product, so it is difficult for me to give you an explicit answer. The most likely culprit is the antispam solution that you have running. In Microsoft Exchange, it could be the Intelligent Message Filter (IMF) or a third-party software/hardware solution.
If you can identify the antispam solution you are using, then you should be able to find out how to configure the settings that are filtering your messages. Check out the Exchange Intelligent Message Filter Crash Course for more information.
Do you have comments on this Ask the Expert Q&A? Let us know.
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