On Wed, Jan 09, 2002 at 11:33:15AM -0500, Hal Burgiss wrote:
> On Wed, Jan 09, 2002 at 11:57:01AM -0000, Chris Bond wrote:
> >
> > Anybody got any good advice for doing the following. I am going to
> > run a script that pulls my incoming email from my ISP via pop3 and
> > feed it into my local smtp server. Currently running the redhat 7.2
> > default sendmail (minus a few minor changes to sendmail.m4).
> >
> > Whats the best way to stop spammers - what rules does sendmail
> > 8.11.6 come (the m4 rules) that may help. Is RBL the best way? I've
> > seen a lot of information on www.mail-abuse.org, just after some
> > comments before I make my choice.
> Just one man's opinion, but those DNS blacklists IMO catch fairly
> small amounts of spam. So use it as one weapon, but don't depend on
> it. I use postfix/header_checks (aggressively) and postfix/access.db
> to bounce as much obvious spam as possible. But occasionally bounce
> legit mail too. Then also, I use procmail to filter stuff to a mailbox
> with even more aggressive rules so I can manually check this stuff. I
> then use this as a database to tighten up the postfix rules. Nothing
> works all the time!!!
Check out SpamAssassin, <spamassassin.taint.org>. Can use
Vupil's razor, <razor.sourceforge.net>, and works with MailScanner,
<www.mailscanner.info> (which also does anti-virus scanning). I've
been amazed with the anti-spam results so far. It uses a graded "hit"
system were various "spam indicative" flaws, like bad messages id's or
a whole line of UPPER CASE SHOUTING, or 100% guaranteed, all carry hit
points. Some, like the SPAM disclaimer of that bogus congress bill,
carry REALLY HIGH hit points. If the hit points cross a certain
threshold (default 5) then it's tagged (or nuked) as spam. I think
Vipul's Razor check defaults to 3.0 hit points but I bumped it to
4. Only seen one false hit on that so far.
Oh... And SpamAssassin works with the various RBL's including
the old mail-abuse RBLs once you sign the agreement. You can set and
adjust hit points on all of them. I've got to feed in the new ones
at {dynablock,blackhole}.wirehub.net yet and can't comment on how
effective they are. SpamAssassin brings them all together in one
big scoring system.
> --
> Hal Burgiss
Mike
--
Michael H. Warfield | (770) 985-6132 | [EMAIL PROTECTED]
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