Spamhaus (A nonprofit organization that maintains Real-time Anti-spam Protection) has announced on their website, that their new DBL (Domain Block List) will be launched on March 1st, 2010. The below is taken from Spamhaus's FAQ regarding the DBL:
"What is the DBL? - The Spamhaus Domain Block List (DBL) is a realtime database of domains of spam landing pages and spam-sources, including known spammers, spam gangs, phishers, spam operations and virus/malware related services. DBL listings are made according to policies outlined in DBL Policy & Listing Criteria.
The database is maintained 24/7 by both an automated system and by Spamhaus Project team members around the world.
We expect the DBL to soon be enabled by default in the popular open source SpamAssassin software and several other commercial offerings."
The DBL will also be included within the SpamAssassin tool in the 3.3.1 release "which will have new code for dealing specifically with domain-only URI BLs such as the DBL, and which prevents querying IP addresses which the DBL does not support."
Gold Lasso uses SpamAssassin within our eLoop Application to assign a SPAM score to clients messages. As soon as the update is available the DBL checking will be available to all of our clients. Spamhaus's DBL addition will be a powerful new tool in identifying potential SPAM issues before an email campaign is launched.
You can read the official announcement here.