Understanding Exchange Server IMF's 3 MB message limit

Exchange IMF, by default, will not scan email messages that are larger than 3 MB. If Exchange IMF runs into a message that's more than 3 MB, it'll log an Event 7515 error in the Application log with the following text:

An error occurred while Microsoft Exchange Intelligent Message Filter attempted to filter a message with ID ####, #### From smtp: #### and Subject ####. This message will not be filtered. The error code is 0x800710f0.

NOTE: The text designated by the hash marks will be different for each message, and s

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hould help you figure out which messages are being ignored.

As it turns out, Exchange IMF is designed not to scan messages more than 3 MB. There are several reasons for this:

About the author: Serdar Yegulalp is editor of the Windows Power Users Newsletter.

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