Weighted Private Block list (WPBL)
WPBL is a private block list consisting of IP addresses which connect to members' systems and deliver unsolicited bulk mail (spam)." The list is designed to be most effective when used by WPBL members, but may not be suitable for other uses. WPBL should not be used to block SMTP connections outright. It is most effective in a scoring system like SpamAssassin.
We monitor this blacklist since 2015-01-01. More information: http://www.wpbl.info/