On Wed, 25 Oct 2006, Jack Stone wrote:
Folks:
I have managed to piece together a shell script that is able to retrieve the
domains from the spams of the day and summarize those in a special file that
can then be added to the sendmail's rejects in the access.db. But, first I
have to eyeball the list and remove any obvious good-guy domains.
I would like to create another list of those same good guys that can be added
to each day as they show up, then compare it to the above main list and
delete the good guy domains before adding to the access.db.
Greylisting will be much more effective than this approach, and is
easier to implement. Combine that with sbl-xbl and maybe a few other
DNSBLs, add greet_pause of five or ten seconds, and you have much more
effectiveness with less false positives and much less maintenance.
Adding clamav rounds out the whole thing. I wrote an article that
covers some of this:
http://www.wonkity.com/~wblock/greylist.pdf
-Warren Block * Rapid City, South Dakota USA
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