[Mimedefang] RBL and DNS lookups

[Daniel Aquino]

> One of the great things about MIMEDefang is that you can add filtering
> that occurs long before SpamAssassin is ever run.  For me, SA gets run
> for about 30% of the connections that come in because of greylisting,
> HELO filtering, etc.

Well SA is pretty fast I was referring to long dns lookups....

But is there any documentation on doing
  reverse->forward lookups,
and
  rbl lookups
in mimedefang?