RBL.JP: Email Blocklist Removal Guide
Japanese DNSBL covering spam sources affecting Japanese mail systems. Primarily deployed in Japanese ISPs and corporate mail environments.
Email reputation
S5H.NET Blacklist: Email Blocklist Removal Guide
Simple independent DNSBL listing IPs that send mail to S5H.net's trap network. Low maintenance overhead for operators, automatic listing and expiry.
Schulte Blacklist: Email Blocklist Removal Guide
Independent DNSBL operated by a German researcher. Has been discontinued. DNS queries return NXDOMAIN or SERVFAIL. Historical reference only.
JIPPG: Email Blocklist Removal Guide
JumpStart Internet Packet Pro Guard — independent spam blocklist from the early 2000s. Long discontinued. Historical reference only.
Konstant: Email Blocklist Removal Guide
Part of the MAPS (Mail Abuse Prevention System) relay blocklist family. MAPS was acquired by Trend Micro and the public free DNSBL service was discontinued. Enterprise subscription only.
Barracuda Reputation BL: Email Blocklist Removal Guide
IP reputation list maintained by Barracuda Networks, fed by over 200,000 spam sensors globally. Used natively by Barracuda email security appliances and optionally by any MTA via DNSBL query.
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.
UCEPROTECT Network: Email Blocklist Removal Guide
Three-level IP blocklist covering individual IPs (Level 1), ASN ranges with high spam ratios (Level 2), and entire ASN blocks (Level 3). Known for aggressive listing policies and paid express…
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.
Sender Score: Email Blocklist Removal Guide
Harness the power of the Sender Score Reputation Network to monitor email trustworthiness and discover proven strategies for improving your sender reputation today.
