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Blacklist wiki · 25 queried live · how to get delisted

Every blocklist that can stop your mail

What each one lists, what a listing actually costs you, and the exact steps to get removed. Written for the moment you find out you are on one.

The directory

Every list we document, with the zone it answers on. Open one for what it lists and how to get off it.

Tier 1: Major blacklists

7 lists

Consulted directly by the big mailbox providers and mail gateways. A listing here can block your mail almost everywhere, so a scan reports it as critical.

  1. Spamhaus ZENzen.spamhaus.orgKnown spam sources, compromised/exploited hosts, and IP ranges that should not be sending unauthenticated email (e.g., residential or dynamic IPs).
  2. SpamCopbl.spamcop.netIP addresses that have been reported as sources of spam by SpamCop users.
  3. Barracuda (BRBL)b.barracudacentral.orgIP addresses identified as sending spam or having poor email sending practices.
  4. Composite Blocking List (CBL)cbl.abuseat.orgIP addresses showing signs of bot/virus infections, open proxies, or other compromised behavior.
  5. UCEPROTECT Level 1dnsbl-1.uceprotect.netIndividual IP addresses detected sending spam or abusive email.
  6. UCEPROTECT Level 2dnsbl-2.uceprotect.netEntire IP allocations where multiple IPs have Level 1 listings.
  7. UCEPROTECT Level 3dnsbl-3.uceprotect.netEntire ISP/ASN ranges due to widespread abuse originating from that network.

Tier 2: Widely used

10 lists

Referenced by many corporate filters and ISPs, usually as one signal among several. A listing costs you some recipients, and a scan reports it as a warning.

  1. Passive Spam Block List (PSBL)psbl.surriel.comIP addresses that have sent email to PSBL spam traps.
  2. S5Hall.s5h.netIP addresses detected sending spam to S5H monitoring networks.
  3. SURBLmulti.surbl.orgDomains (not IPs) that appear in the body/URLs of spam messages.
  4. URIBL Multimulti.uribl.comDomains found in spam email bodies and URLs.
  5. URIBL Blackblack.uribl.comDomains with strong, confirmed associations with spam email content.
  6. Invaluementdnsbl.invaluement.comIP addresses associated with snowshoe spam operations and other sophisticated spam techniques.
  7. Mailspikebl.mailspike.netIP addresses with poor email sending reputation based on Mailspike's analysis.
  8. Mailspike Zero-Hourz.mailspike.netIP addresses involved in newly detected spam campaigns.
  9. DroneBLdnsbl.dronebl.orgCompromised hosts, open proxies, botnet nodes, and other abused infrastructure.
  10. GBUdb Truncatetruncate.gbudb.netIP addresses with consistently poor sending reputation in the GBUdb system.

Tier 3: Additional coverage

17 lists

Smaller or specialist lists with a narrower reach. Lower impact on its own, but worth clearing; a scan reports a listing here as information.

  1. 0spam (FusionZero)0spam.fusionzero.comIP addresses identified as spam sources through trap hits and collaborative filtering.
  2. 0spambl.0spam.orgIP addresses detected sending unsolicited email.
  3. SpamRats SPAMspam.spamrats.comIP addresses detected sending spam to SpamRats monitoring systems.
  4. SpamRats NoPTRnoptr.spamrats.comIP addresses sending email without valid reverse DNS (PTR) records.
  5. SpamRats Authauth.spamrats.comIP addresses involved in brute-force authentication attacks against mail servers.
  6. Backscatterer (SpamEatingMonkey)backscatter.spameatingmonkey.netMail servers that generate backscatter (bounces for forged-sender spam).
  7. SpamEatingMonkeybl.spameatingmonkey.netIP addresses identified as spam sources.
  8. JustSpamdnsbl.justspam.orgIP addresses confirmed as spam sources.
  9. HostKarmahostkarma.junkemailfilter.comIP addresses with negative karma (poor sending reputation) in their scoring system.
  10. InterServer RBLrbl.interserver.netIP addresses detected sending spam to InterServer's network.
  11. imp.ch Spam RBLspamrbl.imp.chIP addresses detected as spam sources.
  12. Kempt DNSBLdnsbl.kempt.netIP addresses involved in spam and email abuse.
  13. Team Cymru Bogonsbogons.cymru.comIP addresses from unallocated or reserved address space (bogon addresses).
  14. Blocklist.debl.blocklist.deIP addresses reported for SSH brute-force, mail abuse, web attacks, and other automated attacks.
  15. Schulte RBLrbl.schulte.orgIP addresses detected sending spam.
  16. Pedantic Spamspam.pedantic.orgIP addresses identified as spam sources through strict analysis.
  17. SPFBLdnsbl.spfbl.netIP addresses with SPF failures or identified as spam sources.

Retired lists

21 lists

These have shut down, or their zones no longer resolve. Nothing queries them and a listing on one cannot affect your mail today. The pages stay because people still search for them.

  1. SORBSdnsbl.sorbs.netRetiredWas a widely used list; SORBS shut down in June 2024.
  2. SORBS Spamspam.dnsbl.sorbs.netRetiredWas a widely used list; SORBS shut down in June 2024.
  3. SORBS Dynamic IP Listdul.dnsbl.sorbs.netRetiredWas a widely used list; SORBS shut down in June 2024.
  4. SORBS New Spamnew.spam.dnsbl.sorbs.netRetiredWas a widely used list; SORBS shut down in June 2024.
  5. SORBS Web Exploitsweb.dnsbl.sorbs.netRetiredWas a widely used list; SORBS shut down in June 2024.
  6. WPBLdb.wpbl.infoRetiredWas a widely used list; WPBL shut down in 2024; its operator retired the zone.
  7. SpamEatingMonkey Netblocknetbl.spameatingmonkey.netRetiredWas an additional list; not updated since June 2019 and fails its own 127.0.0.2 test point.
  8. Unsubscore (LashBack UBL)ubl.unsubscore.comRetiredWas an additional list; the zone no longer exists (NXDOMAIN at its apex).
  9. DNSRBLdnsrbl.orgRetiredWas an additional list; domain lapsed and now parked.
  10. Redhawkaccess.redhawk.orgRetiredWas an additional list; its nameservers no longer answer and its site is gone.
  11. MegaRBLrbl.megarbl.netRetiredWas an additional list; domain lapsed and now parked.
  12. Woody's SMTP Blacklistblacklist.woody.chRetiredWas an additional list; folded into the SWINOG blacklist; the zone lists nothing.
  13. Virus RBL JPvirus.rbl.jpRetiredWas an additional list; the zone no longer exists (NXDOMAIN at its apex).
  14. imp.ch Worm RBLwormrbl.imp.chRetiredWas an additional list; no longer offered by ImproWare; the zone lists nothing, not even its test point.
  15. AUPADSorvedb.aupads.orgRetiredWas an additional list; unchanged since February 2023 and unreachable through Google.
  16. Nether Open Relaysrelays.nether.netRetiredWas an additional list; the zone no longer exists (NXDOMAIN at its apex).
  17. Linköping University Spamblockall.spamblock.unit.liu.seRetiredWas an additional list; the zone no longer exists (NXDOMAIN at its apex).
  18. Fabelbl.fabel.dkRetiredWas an additional list; the zone no longer exists (NXDOMAIN at its apex).
  19. abuse.ch Combinedcombined.abuse.chRetiredWas an additional list; abuse.ch no longer publishes it; no name in the zone returns data.
  20. abuse.ch Dronedrone.abuse.chRetiredWas an additional list; abuse.ch no longer publishes it; no name in the zone returns data.
  21. abuse.ch Spamspam.abuse.chRetiredWas an additional list; abuse.ch no longer publishes it; no name in the zone returns data.

Bounced with a code rather than a listing? Look it up in the error code wiki, which reads the whole bounce and opens the fix.

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