Rich, If you are running Postfix I strongly suggest running Postgrey or other greylisting software.
I saw a 90%+ drop in incoming spam about one day after it was fired up (5+ years ago). This was for around 200 domains. I have had to whitelist a few incoming domains but the stock 'white-list' that comes with the install handles the big ones. This is on about 8 MX servers. The accepted mail is delivered to the actual domain's mail server where spam filtering knocks out most of the rest. YMMV Rod -- On 04/06/2015 08:10 AM, Rich Shepard wrote: > Much spam passing current postfix UCE filters and landing in the INBOX are > from IP addresses that do not resolve to a domain name. The headers include > a 'Received: from <some_domain_name> (unknown [nnn.ooo.ppp.qqq])'. > > Is the unknown IP address a reliable indicator of spam? A Web search did > not answer this question. One hit, to an Apple mail forum, suggested that it > can be the result of some (many?) Mac admins not correctly configuring their > DNS servers. > > Might adding a rule to reject unknown IP addresses produce unintended > consequences of rejecting legitimate non-maillist messages? > > Rich > _______________________________________________ > PLUG mailing list > [email protected] > http://lists.pdxlinux.org/mailman/listinfo/plug _______________________________________________ PLUG mailing list [email protected] http://lists.pdxlinux.org/mailman/listinfo/plug
