[Mimedefang] milter recipient check?

[Les Mikesell]

Is there a way to hook a milter to check recipients only after sendmail 
has already rejected anyone that is not a local or virtual user or 
alias?  I have a steady stream of dictionary attack addresses and have 
set up virtualusers with default rejects for the domains so sendmail can 
reject them quickly.  But now I'm trying to run milter-greylist ahead of 
MimeDefang and it wants to process all the messages.  I can configure it 
to also have a specific list of addresses to process but would like to 
know if there is a better way.  Can the greylisting be done with 
MimeDefang alone in later processing steps, or is there a way to hook 
milter-greylist to run after sendmail has already rejected recipients 
that don't exist?

-- 
   Les Mikesell
    lesmikesell at gmail.com