On Mon, Nov 05, 2007 at 11:11:00AM -0500, Paul Chauvet wrote: > On Thu, 2007-11-01 at 18:25 -0400, Adam wrote: > > Chris Knadle wrote: > > > One favorite are email connections that start off with a HELO/EHLO > > > greeting > > > that isn't a FQDN as is required by RFC 2821. When I started rejecting > > > these > > > it cut out 33% of junk email, without having to do any expensive > > > computation. > > > > Chris, could you explain how to do this, or point me to someplace that > > does? Thanks! > > > > Adam > > In Postfix at least, you can do this with reject_non_fqdn_hostname in > the smtpd_helo_restrictions. In addition we reject a ton of spam from > people who try to HELO/EHLO as our hostname or IP address. in the same > smtpd_helo_restrictions section, we also have: > check_helo_access hash:/opt/pmx4/postfix/etc/helo_access
Thanks for the tip. I just applied this to the mhvlug.org list to help
reduce the amount of stuff clogging up the mailman queues.
-Sean
--
__________________________________________________________________
Sean Dague Mid-Hudson Valley
sean at dague dot net Linux Users Group
http://dague.net http://mhvlug.org
There is no silver bullet. Plus, werewolves make better neighbors
than zombies, and they tend to keep the vampire population down.
__________________________________________________________________
signature.asc
Description: Digital signature
_______________________________________________ Mid-Hudson Valley Linux Users Group http://mhvlug.org http://mhvlug.org/cgi-bin/mailman/listinfo/mhvlug Upcoming Meetings (6pm - 8pm) MHVLS Auditorium Oct 3 - Security and Privacy Nov 7 - Django Python Application Framework
