I have found that greylisting based on the Spamhaus sbl-xbl list
massively reduces spam. Setting that up on my backup MX
resulted in all traffic through it stopping when my primary MX is
up.
James,
Are you using greylisting or blacklisting with Spamhaus? My understanding
of blacklisting is that blacklisting uses a DNS blacklist, such as
Spamhaus. My understanding of greylisting is when your MTA sends back a
temporary failure the first time in X number of days where it sees a new
sender/receiver/mail server IP address triplicate. Please clarify.
Thanks,
Barry
_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
http://lists.centos.org/mailman/listinfo/centos
