Thanks Bill. More good information that I can use. To those who prefer spam over SPAM, I have no personal preference, I don't particularly enjoy either ;-)
On 7/2/2008 at 12:30 AM Bill Broadley sent: >Sorry to comment late, but I figured I'd throw my input in. > >First of all the idea behind grey listing is quite sound, it's an official >part of the SMTP standard and anyone who can't deal with it is running a >broken mail server that will fail in many real world scenarios that do not >involve greylisting. A please try again later can come up for numerous >reasons, system load, maintenance windows, system failure, etc. > >I've found it to be rather effective, when combined with HELO filtering >can be >quite effective at cutting down the amount of SPAM and makes it much >easier to >run a mailserver that saves the most cpu intensive SPAM/Virus scanning for >the >much reduced traffic that makes it through. This graph is representative >to what I saw: > http://postgrey.schweikert.ch/mailgraph_greylisting.png > >The compatibility from what I can see is pretty good, I've seen zero >problems >with the bigger systems like yahoo, gmail and the like. Sure some travel >agent running some wonky mailserver that he bought as a turnkey package >from >some clueless company 5 years ago might have this incompatibility, but 10% >of his email vanishes into the either because it doesn't handle SMTP >properly >in many ways... but typically such folks adapt and will follow up from a >gmail >account or something. Real estate agents seem to have similar problems. > >Additional documentation for postfix is at: >http://www.postfix.org/SMTPD_POLICY_README.html > >The above also includes a sample greylisting daemon if you don't want to >use >postgrey. > >Other implementations at: >http://www.greylisting.org/implementations/postfix.shtml _______________________________________________ vox-tech mailing list vox-tech@lists.lugod.org http://lists.lugod.org/mailman/listinfo/vox-tech