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๐Ÿ›ก๏ธ Blacklist (DNSBL) Monitor

The Blacklist monitor checks if your server's IP address appears on any DNS-based blacklists (DNSBLs). Being blacklisted can cause your emails to be rejected or your website to be flagged as malicious.

๐ŸŽฏ What It Doesโ€‹

  • Performs a reverse IP lookup on your server
  • Checks the IP against 20 popular DNSBL lists
  • Reports which lists your IP appears on
  • Alerts immediately if any blacklisting is detected

๐Ÿ›ก๏ธ DNSBL Lists Checkedโ€‹

Monitron checks against these blacklists:

  1. zen.spamhaus.org
  2. bl.spamcop.net
  3. b.barracudacentral.org
  4. dnsbl.sorbs.net
  5. spam.dnsbl.sorbs.net
  6. dul.dnsbl.sorbs.net
  7. dnsbl-1.uceprotect.net
  8. dnsbl-2.uceprotect.net
  9. dnsbl-3.uceprotect.net
  10. dyna.spamrats.com
  11. noptr.spamrats.com
  12. spam.spamrats.com
  13. cbl.abuseat.org
  14. dnsbl.dronebl.org
  15. rbl.interserver.net
  16. psbl.surriel.com
  17. db.wpbl.info
  18. all.s5h.net
  19. ix.dnsbl.manitu.net
  20. virus.rbl.jp

โš™๏ธ Configurationโ€‹

SettingDescriptionExample
NameA friendly nameMail Server Blacklist Check
Host / IPYour server's IP or hostnamemail.example.com
IntervalHow often to check1 hour

๐Ÿ’ก Tipsโ€‹

  • Run this on your mail server's IP โ€” that's where blacklisting matters most.
  • If you get blacklisted, check which list and follow their delisting process.
  • Common causes: compromised accounts sending spam, open relay, misconfigured SPF/DKIM.
  • Daily or hourly checks are sufficient โ€” blacklists don't update in real-time.