Spam Assassin is worth looking at http://spamassassin.sourceforge.net
It performs textual analysis of mails and scores them. It also looks up known
spammers and includes the Vipul's Razor collective spam database that was
featured on Slashdot a couple of days ago.
The Perl version is probably a bit slow for ISP use, but they have now
introduced a daemon version with ISP's in mind.
Here is an example of the header it adds to any Spam mail it finds
SPAM: -------------------- Start SpamAssassin results ----------------------
SPAM: This mail is probably spam. The original message has been altered
SPAM: so you can recognise or block similar unwanted mail in future, using
SPAM: the built-in mail filtering support in your mail reader.
SPAM:
SPAM: Content analysis details: (16 hits, 5 required)
SPAM: Hit! (3 points) Faked To "Undisclosed-Recipients"
SPAM: Hit! (0.1 points) Subject has an exclamation mark
SPAM: Hit! (1 point) Subject has lots of exclamation marks
SPAM: Hit! (2.7 points) BODY: /<SCRIPT.*LANGUAGE.*JavaScript/i
SPAM: Hit! (0.7 points) BODY:
/on(?:Blur|Error|KeyDown|KeyUp|Load|MouseOver|Resize|Unload)/i
SPAM: Hit! (2.5 points) /\n\n.{0,160}<!-- saved from urlc
SPAM: Hit! (2 points) /click here.{0,100}<\/a>/is
SPAM: Hit! (2 points) Received via a relay in relays.ordb.org
SPAM: [RBL check: found relay
135.67.13.61.relays.ordb.org.]
SPAM: Hit! (2 points) Received via a relay in relays.osirusoft.com
SPAM: [RBL check: found relay
15.35.134.209.relays.osirusoft.com., type: 127.0.0.4]
SPAM:
SPAM: -------------------- End of SpamAssassin results ---------------------
HTH
Derek
On Tuesday 04 December 2001 16:12, you wrote:
> I am a new sysadmin for my ISP.. we have a horrible spam problem here, and
> no one has done anything in the past to resolve it. I have decent linux
> experience, but i wouldnt exactly call myself a pro.. :) i have been
> looking into blackmail, but it seems very difficult to install. I was
> wondering if anyone out there knew of an AWESOME spam filter, that can be
> used system-wide (for ISP use) and is EASY to install and administer.. can
> anyone please help me?!?!? :)
>
> THANKS!
> - Matt
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