The reason I want greylisting to work first is to eliminate those zombie machines that attempt to
send zillions of emails. Typically they get a reject and just move on. That way load is cut down
on my system.
I doubt that the ordering of greylisting and DNSBLs makes much
difference load-wise. Both are fairly fast operations that don't involve
reaching the DATA phase of the SMTP transaction. Unless perhaps you've
got a slow network connection, so the DNS lookups take a long time.
If you're determined to have the greylisting take place first, you might
consider running the dnsbl milter from
http://www.five-ten-sg.com/dnsbl.html, which would enable you to remove
the DNSBLs from the sendmail configuration file and have them tested
later on in a milter. You can specify the order of milters any way you
like.
Paul.
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Thanks, Paul. I'll check it out.
Mike
