No, you can't access message headers in the SMTP transaction filter. It would probably be possible to create a daemon to do it with the new, not yet publicized daemon interface, though. Still I'm not sure it's always wise to reject on mismatch here; a redirected message might have the mail address of the person redirecting it as SMTP MAIL FROM.

/Rolf 

I'm starting to see an increasing amount of spam get through where the MAIL FROM on the header is a valid local user (usually the same as the RCPT TO).  But the from address within the DATA portion is a different address.  Since the MAIL FROM is a valid local user, I cannot add it to the killfile.  Is it possible to reject these messages, where the from address doesn't match, using Transaction Level Filtering?

Thanks!