[Mimedefang] Adding support for learning our addresses

[Kevin A. McGrail]

The project can only pay for so much bandwidth and it's not a solution that
scales to multipoint distribution like an RBL via DNS.

So at the moment, they are handpicking the people who get to use the system.

Regards,
KAM

> > If you would like to use the system, email me your daily mail volume and
> > I'll forward your request.  If approved, I'll send you the MD code and SA
> > rule files.
> 
> Why not add it to the wiki?