Sander Holthaus - Orange XL said: > [EMAIL PROTECTED] wrote: >> Steve Jacobson writes: >> >> >>> Well, I finally figured out why tarpitting isn't deterring the >>> SPAMmers hitting my server. Every request appears to come from a >>> different IP. Over 3000 just today. This is why we need Greylisting >>> in >> >> BLACKLISTS="-block=sbl-xbl.spamhaus.org,BLOCK" >> >> >> This should nail most of those. >> > > I use it too, but the the reduction of spam is comparitivly small :-( It > appears that they'll just try to relay the message through a different IP > and that succeeds quite often :-(
DNS BLs are useless unless all of your MXs for the domain use them. Many spammers now try the highest MX record *first*. If the MX is just a backup relay at your ISP that doesn't use a BL then it will of course accept the mail and your mail server will of course accept the mail from your trusted backup MX. Either reign in control of all your MXs, applying the same address verificaton and anti-spam filters on all of them, or as Sam recommends, don't use backup MXs at all, mail will still be held for up to 4 days on properly configured servers... Jay -- Jay Lee Network / Systems Administrator Information Technology Dept. Philadelphia Biblical University -- ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf _______________________________________________ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
