A validated database of mail servers that permit third-party relay. Also in Francais, Nederlands and Dansk.

The CBL is a DNSBL which takes its source data from very large spamtraps, and lists IPs of open proxies and worms/viruses.

Lists email sites which have refused to limit their relaying, leaving the potential for their use as spam gateways.

Enter an IP address or a hostname to find out which blacklists (if any) list it.

Blacklist of open relaying mail servers that have recently transmitted spam.

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.

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.

MAPS aims to defend the Internet from spammers by educating ISPs and providing real time blocking lists of known spam sources.

SPEWS maintains a list of known spam sources and spam friendly hosts so that e-mail can be rejected from these problem sites.

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).

Personal list of abusive networks that the author blocks from sending mail or accessing his web servers.

Automated spam blocklist system, designed to block spam at the SMTP level.

Publishes a list of known abusive hosts (open relays, open proxies, spam sources, DoS drones, and more) in various forms including a DNSbl.

The RSS is a list of email relays which have been used to send spam, for use in blocking spam by blocking mail which have gone through those sites.

An IP blacklist of dialup-using "stealth" spammers and email trespassers.