[Mimedefang] Reject vs Drop and MX

[Richard A Nelson]

I've a few MX that aren't under my control, and have a few other
machines that forward mail to me (also not under my control).

I'm currently Rejecting (5xx) virus and high scoring spam, which
will cause the forwarding MTA to issue bounces :(  However, the
Reject works well for the direct connects.

What I'd like to do, is extend the filter with a function to
either:
	1) Drop the mail if received from a list of relay hosts
	2) Reject the mail otherwise

Before I jump off the deep end and (poorly) re-invent the wheel,
has anyone already done this (and can share the work) - or are
other things for me to take into account in doing this ?

Thanks,
-- 
Rick Nelson
Life'll kill ya                         -- Warren Zevon
Then you'll be dead                     -- Life'll kill ya