[Spambayes] Bouncing Spam

[Matt Sergeant]

Steve Atkins said the following on 27/11/02 04:17:
> The only way to safely bounce spam is to drop it with a permanent
> (5xx) rejection at an appropriate point in the SMTP transaction at the
> first point it enters your network (i.e. if your secondary MX accepts
> it, don't reject the delivery to your primary). Even then you need to
> read RFC 2821 very carefully. A lot of people throw non-defined errors
> or throw them at the wrong point in the transaction, which can make
> things worse rather than better. Doing this with the MTAs support is
> the only easy way to do it.

Another thing that came up discussing this on the SpamAssassin list is 
that this only works on the mail server that is your MX server. If you 
get mail through a third party (e.g. an ISP that might forward to your 
SMTP server) then it doesn't work.

Matt.