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Blocklists & Spam Monitoring
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.
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Blocklists & Spam Monitoring
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.
smtpedia.com/sorbs-rhsbl-removal -
Blocklists & Spam Monitoring
SURBL: Email Blocklist Removal Guide
Lists domains appearing in spam message bodies — not the sending domain, but the URLs the message links to. Queried by SpamAssassin and many commercial filters during content scanning.
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Blocklists & Spam Monitoring
Abusix Mail Intelligence: Email Blocklist Removal Guide
Multi-component blocklist covering IPs involved in spam, malware distribution, and exploit activity. Includes separate zones for spam, exploits, and domain abuse. Widely used by enterprise mail filters.
smtpedia.com/abusix-blacklist-removal -
Blocklists & Spam Monitoring
Nordspam: Email Blocklist Removal Guide
Scandinavian-origin DNSBL focused on spam sources identified via trap networks. Used as a scoring component in some Nordic mail infrastructure.
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Blocklists & Spam Monitoring
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.
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Blocklists & Spam Monitoring
MSRBL: Email Blocklist Removal Guide
Formerly listed phishing and spam sources. Discontinued around 2013. DNS queries return NXDOMAIN. Historical reference only.
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Blocklists & Spam Monitoring
Hostkarma Black: Email Blocklist Removal Guide
Karma-based IP reputation system from JunkEmailFilter. Positive karma for good senders (whitelist), negative karma for spam sources (blacklist). Also operates a yellow zone for unknown senders.
smtpedia.com/hostkarma-black-removal -
Blocklists & Spam Monitoring
HIL Blacklist: Email Blocklist Removal Guide
Formerly a sender certification and reputation list from Habeas (acquired by Return Path). Discontinued when Return Path moved to different certification models.
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Blocklists & Spam Monitoring
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.
smtpedia.com/nether-blacklist-removal
