Spamhaus DBL: Email Blocklist Removal Guide
Right-hand side domain blocklist targeting sending domains and URLs found in spam. Checked against the domain in the From: header and links in the message body. Used heavily by spam…
Domain Delisting
SORBS RHSBL: Email Blocklist Removal Guide
Domain-level blocklist from SORBS flagging sending domains associated with abusive behaviour. Acquired by Proofpoint in 2011; maintenance has been inconsistent since. Some filters still query it.
