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Blacklist sweep 12 categorized RBLs · sender reputation, content, policy

Blacklist Sweep

Most blacklist tools query 100+ RBLs and surface a flat list of "found here, found there." That's noise. We check 12 lists across three categories, sender reputation, content/URL, and policy, and tell you which ones actually matter for your sending. Honest, never noisy.

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+The 12 lists, categorized

Three categories.
Each tells you something different.

/ 01. Sender reputation
7 sender-IP lists
Spamhaus Zen (DQS), Barracuda, SpamCop, SORBS, PSBL, UCEPROTECT, Backscatterer. Listings here mean your mail-sending IPs are flagged.
/ 02. Content lists
5 URL/domain lists
Spamhaus DBL (DQS), URIBL Black, URIBL Grey, SURBL Multi, SEM URIBL. Listings flag domains found inside spam, not the senders themselves.
/ 03. Policy lists
2 policy signals
Spamhaus ZRD and SEM Fresh. Flag newly-registered domains. Not necessarily bad, just informational for receivers.
+Built different

Most checkers query 100+ RBLs.
We query 14, and tell you which ones actually matter.

Categorized by what each list represents. Per-MX expandable details. Honest verdict, never inflated.

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Continue learning
Staying Off the Blacklists That MatterWhich lists receivers actually consult.Read guide → Why Your Emails Go to SpamThe most common causes, and how to fix each.Read guide → Salesforce Deliverability TroubleshootingWhen Salesforce mail stops reaching the inbox.Read guide → What Is Email DeliverabilityThe plain-English version.Read guide →