[Mimedefang] Greylisting++

[John Rudd]

David F. Skoll wrote:

> 
> So our (post-DATA) greylister takes into account the 4-tuple
> (sender-e-mail, recipient-e-mail, sender-ip, message-subject) for
> greylisting purposes.  Works really well!  (Alas, not patentable
> because there is prior mention of this technique elsewhere...)


I've often wondered about including the message-id in the tuple, as well 
as trying to track the same message-id coming from different senders, 
and whether or not that's a usable spam-sign.