Restrict Sending From Address?

Looking at using the restrict_senders plugin, but from my digging that  
appears to work on IMAP username/domain they are logged in under.

Is there a plugin or anyway to restrict what a user puts in the from/ 
reply to fields. Trying to stem some of the crap that comes through  
the Webmail servers when $sillyUser falls for a phish or $badPerson  
guesses their password, and webmail is turned into 419/spam cannon for  
the 20-30 minutes till we find and kill it.

Going to be using restrict_senders to rate limit /block that way, but  
looking for even more way to tighten it down.

If no plugin exists I might look at coding one myself..

Thanks,
-Patrick

--
Patrick Muldoon
Network/Software Engineer
INOC (http://www.inoc.net)
PGPKEY (http://www.inoc.net/~doon)
Key ID: 0x370D752C

 >Select * from users where clue > 0
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