Generally matters like this are handled by integration tools such as
MailScanner, amavisd-new, etc, although I do not know of any that
provide comprehensive quarantine management. That said, I've never
desired such, so I've not looked at length for one. (I mostly just tag
mail, and let users filter at the client level as they see fit.)
The (slightly-dormant) MailWatch project integrates with MailScanner and
SpamAssassin to add quarantine notifications, management, message release,
etc. It stores message information in MySQL which you can query to find
interesting things.
Anthony
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