Hi. On Saturday 13 September 2008, Ray Collazo wrote: > If you know of a better way to get rid of Junk Mail coming from bots and > zombies, I'm all ears.
Greylisting and HELO-check. Those are two of the great inventions of the past years as the concepts do not hurt any RFC-compliant sender. Everybody can behave correctly, no matter what IP-address he uses. We have a very conservative greylisting-setup with extended whitelisting abilities to not loose regular mail. Additionally, we use the "zombie"-list from sorbs for hard blacklisting and have activated the courier-HELO-check for all hosts that are suspicious on various DNSRBLs. (Disclaimer: HELO-check fails on a lot of regular senders, so use HELO-checking only for suspicious hosts that you would block at the moment.) Since we set this combination up, we don't have a spam problem any more. All our users can use spamassassin for the varios spams that originate from AOL, yahoo or something like this and cannot be blocked otherwise. But even without this, there's not much spam any more. Sure, blocking all and every suspicious IP address is the easiest way to go and most of the "mainstream" customers will not be hurt by this, as long as you don't block AOL. But I think it's not a good idea to block someone just because of his IP-range. The zombie-list contains single hosts that have sent many spams. The DUL contains IP addresses that did nothing wrong but just belong (or did so some time ago) to an ISP that does dynamic allocation. regards, Bernd -- Windows Error 019: User error. It's not our fault. Is not! Is not!
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