[CentOS] spam control

Wed Oct 25 14:26:01 UTC 2006
Bill Baird <Bill.Baird at phoenixmi.com>

> > 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

I believe he means that he is only greylisting incoming email when the server is listed in spamhaus. All other mail comes through without being greylisted (resulting in normal delivery times)

--Bill