[CentOS] spam control

Barry Brimer lists at brimer.org
Wed Oct 25 13:52:25 UTC 2006

> 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.


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.


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