> > 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