[mdlug] Question on Spam

[Rich Clark <rrclark@rrclark.net>]

On Wed, 5 Sep 2007, Dave Arbogast wrote:

> Does anyone know the folks at spamhaus or orbs ? Maybe this can be an 
> off-shoot of their service ? Most non-manufacturing companies here have 
> absolutely no business in CN.... it would be to their benefit to taylor 
> their accepted SMTP connections.

Maybe you're looking for something like the www.nerd.dk country lists. 
They function similar to any other RBL and can be plugged into postfix 
thusly:

/etc/postfix/main.cf:

smtpd_client_restrictions =
         permit_mynetworks,
         check_client_access hash:/etc/postfix/client_restrictions,
         reject_rbl_client zen.spamhaus.org,
         reject_rbl_client cn.countries.nerd.dk,
         reject_rbl_client kr.countries.nerd.dk,
         reject_rbl_client pl.countries.nerd.dk,
         reject_rbl_client sa.countries.nerd.dk,
 	reject_rbl_client ru.countries.nerd.dk

This will stop the listed connecting client at the HELO/EHLO phase of the 
SMTP conversation, thus saving many wasted CPU cycles on unnecessary 
processes.