[BUGS] trapping spam from headers

[jonathan michaels]

On Wed, Mar 05, 2008 at 08:34:10PM +1100, Peter Jeremy wrote:
> 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).

RBL's may have as tome stage been a good idea .. i no longer
think that tthye are worth the data-stream that they pretend to
stop. there mybe a few (very few) reputible managers but from
teh complaints that i have heard, even about the honest rbl
managers who also make honest mistakes. it is what they do
after the 'false listing'/'mistake' is made is what
difereniates good/bad ..

even so i don't think that rbl's are worth much beyond 'feel
good' esentially . .anyway
 
> 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.

i have been doing some reading on Bayesian filtering of late
and would like to do it that way, but havent found much reading
material on this topic in teh freebsd/sendmail world, so i am
thinking perhaps postfix might be a better way forward ???

after some preliminary searches i've seen that postfix configs
are readable and managable (from my perspective).

any idea's beyond /usr/ports/"mailers toolkits" anything stand
out as working better than the others ??

regards/appreciations/much thanks

jonathan 



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