ZapBL: Email Blocklist Removal Guide
Independent DNSBL listing spam sources and open relays. Used by a subset of mail server operators and SpamAssassin configurations.
Delisting process
JIPPG: Email Blocklist Removal Guide
JumpStart Internet Packet Pro Guard — independent spam blocklist from the early 2000s. Long discontinued. Historical reference only.
DAN TOR: Email Blocklist Removal Guide
Lists known Tor exit nodes. Not a spam blocklist but used by some mail servers to flag or reject mail from anonymous Tor network infrastructure.
