Thoughts about finding viruses in email inboxes

[David M. Karr]

If I have clamav running an automated scan each night, and it finds a 
virus in my IMAP inbox, what good does that do me?  I have 156 messages 
in my Inbox currently, and no way to know which one has the virus 
(although it's pretty likely it was one of the messages I've received in 
the last 24 hours).  It seems like it would be useful for clamav to have 
some sort of integration/knowledge with the mail system, so it can 
provide better information about which email message has a virus.  Is 
there any practical way to do this?  Has this ever been considered?