[Mimedefang] Powerful anti-spam rule that never discards vali d e-mail

[David F. Skoll]

On Wed, 15 Jan 2003, Les Mikesell wrote:

> It may not be this easy.  I just did an overnight run with a higher and
> lower MX record pointing to a firewalled address that would return an
> ICMP DENIED instead of connecting and still saw about the usual amount
> of spam coming in so most of the senders must do the quick retry to
> an alternate MX.  I didn't do anything to log the rejections so a few
> might have given up but it wasn't dramatic.

I believe the spamware might try all the MX records once, and then give
up.  That's why blocking unknown senders on every MX machine the very
first time seems to work so well.

--
David.