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SpamAssassin includes support for many of the bigger DNSBLs, with optimal scores (or at least, optimal as determined by the GeneticAlgorithm).

Black Lists

Support for these the following DNSBLs is built-in, and shipped in the default configuration.

All of the free BL services are enabled by default. However, note that if you're using mail-abuse.org, and DSBL http://dsbl.org/ BR NAJBL http://www.njabl.org/dynablock.html BR RHSBL dnsbl.ahbl.org BR SORBS http://www.sorbs.net/ BR Spamhaus SBL+XBL http://www.spamhaus.org/ BR SECURITYSAGE blackholes.securitysage.com BR SPAMCOP http://www.spamcop.net/ BR MAPS http://www.mailabuse.org/ BR If you're installing SpamAssassin for site-wide use, you must license their services; mail-abuse.org is now only free for personal use. (Note that SpamAssassin still works very well without using these two services, however.)

Policy Lists

The following DNSBLs are not specifically about spam, but instead abou't sites which break net policies and conventions... practices which are often associated with spammers.

Combined Bogon IP/Hijacked IP/Invalid Whois/ http://www.completewhois.com/bogons/index.htm BR RFC Ignorant http://www.rfc-ignorant.org/ BR
Some people disable or score down the RFC Ignorant list because they get false positives from sites which aren't maintained well. Others prefer not to accept their mail.

Whitelists

The following dns checks are actually for WHITE lists, or sites which are certified by someone to be a reasonable sender.

Bonded Sender Program Trusted sender in Bonded Sender ProgramBR IADB Vouched ISIPP Vouched for SenderBR Habeas Accredited Senders Habeas accreddited senderBR

Accuracy

Live accuracy figures for most of the DNSBLs used in [SpamAssassin], based on the Oct 2003 mail feed for one user, can be found \[http://taint.org/2003/11/07/184247a_mail.html here\].

Other Lists

Other places to find out about DNS blacklists / blocklists:

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