What is the exact message from Mimesweeper? Do you have a copy of the E-mail that was caught by Mimesweeper, with the full headers?It appears that the latest version of Clearswift Mimesweeper has a problem receiving emails from servers running Declude AV. The software apparently quarantines them as "undetermined" due to malformed headers. It especially seems to be an issue when using HTML formatted emails.
A search for Mimesweeper and "malformed headers" on Google showed 2 hits that didn't provide much information.
-Scott
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[This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)]
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