The Tiopan Blacklists
The Tiopan Blacklists consist of bl.tiopan.com (blacklisted IPs) and dbl.tiopan.com (blacklisted domains). The Tiopan Blacklists can be used on various mail servers to directly block undesirable IP/domain at the SMTP level or through scoring.
They list both dynamic and static IP’s. Listing in the Tiopan Blacklists means that they do not accept communication from the listed IP and domain.