[BUGS] trapping spam from headers

[Peter Jeremy]

On Wed, Mar 05, 2008 at 07:48:49PM +1100, Andrew Reilly wrote:
>Legitimate ISP clients *should* be routing their out-bound mail via  
>the ISP's SMTP server, so this one is probably a spam-bot.

That assumes that the ISP is actually competent and can manage an SMTP
server - I know at least one that can't.  RBLs are a really bad idea
because it's far too easy for the ISP's SMTP server to wind up on one
(again, I can give example).

Currently, one of the best anti-spam measures is greylisting.  This
will get rid of most of the low-hanging fruit and saves you having to
accept the spam.  Some sort of Bayesian filter should sop up most of
what is left.

-- 
Peter Jeremy
Please excuse any delays as the result of my ISP's inability to implement
an MTA that is either RFC2821-compliant or matches their claimed behaviour.
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