[ Fighting Spam
| Dialup Zones
| Blacklists Compared
| Current Blacklist Comparison
| Sendmail Configuration
These pages document some of my efforts to fight unsolicited bulk
e-mail, or "spam" as it is commonly called.
One technique that is very effective for blocking spam is to maintain
one or more blacklists of spam sources, and then refuse all e-mail
from those sources. The hard part is choosing the best blacklist(s),
because different blacklists have different listing policies, and the
more aggressive ones often list sources that send legitimate e-mail as
well as spam. Other lists are so conservative that they block almost
nothing at all. To aid in the selection of one or more of the public
DNS-based blacklists I publish a
comparison report that
summarizes my weekly survey results.
I maintain my own list of dialup zones,
but it is not available as a DNS-based blacklist.
See how I have modified Sendmail
to block a large fraction of the spam that is sent to
This document was last updated by
Jeff Makey <firstname.lastname@example.org> on
14 August 2012.