> > A bounce should *always* include a MIME attachment of type
> > message/rfc822-headers which contains the full headers from the original
> > mail. This makes it relatively easy to check on the receiving side if the
> > original "Received: from" headers are valid, and simply drop bounces that
> > relate to messages that were originally sent with forged headers.

> Outstanding idea. If you (or anyone else on the list) already have a
> tested procmail recipe for this, please share. If not, let's make one
> and share it around...

Done that:

http://volker.dnsalias.net/soft/procmail/virusnotification.rc

As a quick guess, the received: recipe catches 1/2 - 2/3 of all
responses from those idiots, though I'm not recording exactly which
recipe triggers because I don't care which rubbish it is.

Anything can be improved, of course.

Volker

--
Volker Kuhlmann is possibly list0570 with the domain in header
http://volker.dnsalias.net/ Please do not CC list postings to me.

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