SEM Blacklists: Email Blocklist Removal Guide
Sender Score reputation network from Validity. Assigns IPs a reputation score (0-100) rather than a binary listed/not-listed verdict. Used by major ESPs and filtering systems.
Spam filtering
NETHER Blacklists: Email Blocklist Removal Guide
Formerly listed open relays (RELAYS zone) and uncertain mail sources (UNSURE zone). Has not been actively maintained since the mid-2010s. Still queried by some legacy SpamAssassin configurations.
