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Directory Sites
Spam Prevention Early Warning System (SPEWS)
SPEWS maintains a list of known spam sources and spam friendly hosts so that e-mail can be rejected from these problem sites.
www.spews.org
SpamCop - Blocking List Information
This list contains IP addresses which have been reported to SpamCop as carriers of spam (source of e-mail or verified, open relay). Some of these reports now come from spamtraps (email addresses used strictly to receive spam).
spamcop.net
All IPs on the SBL belong to known spammers, spam gangs, or spam support services. The SBL includes IPs from both the ROKSO database and IPs of spam services listed in the Spamhaus database.
www.spamhaus.org
The Spamhaus Project Register of Known Spam Operations (ROKSO)
ROKSO collates evidence on known hard-line spam outfits that have been thrown off Internet Service Providers over three times.
www.spamhaus.org
Weekly reports of DNS blacklists lookups of IP addresses (and reverse DNS lookups) that made SMTP connections to the San Diego Supercomputer Center on that week. Useful for getting a grasp of the size of the various blacklists. Maintained by Jeff Makey.
www.sdsc.edu
Blacklist that includes dialup equivalent ip addresses, individual spam sources, netblocks that refuse to remove spammers, bulk mailers that don't require confirmed opt-in, output servers from multi-stage open relay chains and single stage open relays not listed on ORBZ.
www.five-ten-sg.com
Personal (DNSBL) list of abusive networks that the author blocks from sending mail or accessing his web servers.
www.spambag.org
The home for domains who don't play by the rules. A number of lists (at present "dsn", "abuse", "postmaster", "whois" and "ipwhois") which contain domains or IP networks whose administrators choose not to obey the RFC's, the building block "rules" of the net.
www.rfc-ignorant.org
Not Just Another BlackList (NJABL.ORG)
Spam blocking blacklist of open relays, dial-ups, and direct spam sources.
njabl.org
Drbcheck: Dr. Jørgen Mash's DNS Database List Checker
Lists all DNSbl's (RBL's) and enables users to make a query against all the lists.
moensted.dk
Distributed Server Boycott List (DSBL.org)
This list contains email servers which are non-secure and potentially servers with dumb and/or malicious users. It is purely composed of data DSBL receives; DSBL should never send out data by itself.
www.dsbl.org
Electric Eye Ultimate Banned List
A manually updated and verified online database of spammers. Provides email address and domain blocklist.
electriceye.net
Lists IP blocks of China and Korea for those who want to avoid asian spam.
www.okean.com
Publishing a variety of DNS blocklists including entire countries and ISP's.
blackholes.us
Spam Support Permanent Blocklist
A permanent blocklist of spam supporting web hosts and ISPs.
sspbl.tripod.com