This category contains sites that maintain spam blacklists. Some of these blacklists are services that can be used to filter e-mail, and other blacklists are simply lists of spam-friendly ISP's and companies. Blacklists are distinct from spam filters; blacklists provide information about known spammers, but do not by themselves prevent spam from being received. Filters are programs that prevent a user from seeing spam (possibly by using a blacklist.)
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- Blacklists Compared 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.
- Blacklist Master Email blacklist check tool. Check your mail server's IP address and domain name against 200+ spam blacklists.
- MIPSpace A list of IP Addresses associated with known commercial marketing companies.
- Intra2net Blacklist Monitor - Weekly Blacklist Statistics Weekly statistics of success and failure rates for specific blacklists, tracking over 40 different DNSBL, RBL and URIBL lists.
- Global eBusiness Solutions Email blacklist learning resources.
- DNSBL Resource Current news and information about anti-spam blacklists.