DrMx DNS Realtime Black List
DrMx DNS Realtime Blacklist is an enterprise IP blocklist that uses spam traps and traffic analysis to provide real-time anti-spam protection.
Updated on 17 Jun 2026: We updated this guide to clarify DNSBL lookups, delisting steps, and DrMx listing impact.
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Check if you are listed on DrMx DNS Realtime Black List
And 143 other blocklists.
Spamhaus
0Spam
Cisco
NoSolicitado
URIBL
abuse.ro
ALPHANET
Anonmails
Ascams
BLOCKEDSERVERS
Calivent Networks
EFnet
JustSpam
Kempt.net
NordSpam
RV-SOFT Technology
Scientific Spam
Spamikaze
SpamRATS
SPFBL
Suomispam
System 5 Hosting
Team Cymru
Validity
www.blocklist.de Fail2Ban-Reporting Service
ZapBL
2stepback.dk
Fayntic Services
ORB UK
technoirc.org
TechTheftSpamhaus0SpamCiscoNoSolicitadoURIBLabuse.roALPHANETAnonmailsAscamsBLOCKEDSERVERSCalivent NetworksEFnetJustSpamKempt.netNordSpamRV-SOFT TechnologyScientific SpamSpamikazeSpamRATSSPFBLSuomispamSystem 5 HostingTeam CymruValiditywww.blocklist.de Fail2Ban-Reporting ServiceZapBL2stepback.dkFayntic ServicesORB UKtechnoirc.orgTechTheftSpamhaus0SpamCiscoNoSolicitadoURIBLabuse.roALPHANETAnonmailsAscamsBLOCKEDSERVERSCalivent NetworksEFnetJustSpamKempt.netNordSpamRV-SOFT TechnologyScientific SpamSpamikazeSpamRATSSPFBLSuomispamSystem 5 HostingTeam CymruValiditywww.blocklist.de Fail2Ban-Reporting ServiceZapBL2stepback.dkFayntic ServicesORB UKtechnoirc.orgTechTheftSpamhaus0SpamCiscoNoSolicitadoURIBLabuse.roALPHANETAnonmailsAscamsBLOCKEDSERVERSCalivent NetworksEFnetJustSpamKempt.netNordSpamRV-SOFT TechnologyScientific SpamSpamikazeSpamRATSSPFBLSuomispamSystem 5 HostingTeam CymruValiditywww.blocklist.de Fail2Ban-Reporting ServiceZapBL2stepback.dkFayntic ServicesORB UKtechnoirc.orgTechTheftSpamhaus0SpamCiscoNoSolicitadoURIBLabuse.roALPHANETAnonmailsAscamsBLOCKEDSERVERSCalivent NetworksEFnetJustSpamKempt.netNordSpamRV-SOFT TechnologyScientific SpamSpamikazeSpamRATSSPFBLSuomispamSystem 5 HostingTeam CymruValiditywww.blocklist.de Fail2Ban-Reporting ServiceZapBL2stepback.dkFayntic ServicesORB UKtechnoirc.orgTechTheftWhat is DrMx DNS Realtime Black List?
The DrMx DNS Realtime Black List is an enterprise-level Domain Name System blocklist, also described as a DNSBL or RBL, used to identify and filter spam sources. It analyzes IP addresses associated with unsolicited email and other abusive activity. This blacklist (or blocklist) is a realtime DNS feed, so participating mail systems can check sender IP reputation during mail acceptance.
According to its policy, the DrMx DNS Realtime Black List aggregates data from several sources to build its list of problematic IP addresses. These sources include:
- Proprietary spam traps designed to attract and identify spam.
- Real SMTP traffic data submitted by participating internet operators and partners.
- Data mirrored from other DNS blacklists to broaden coverage.
Technically, it is an IP-based blacklist operating on the zone bl.drmx.org. A mail server checks the connecting IP address, not the visible From domain alone, then decides whether to accept, reject, quarantine, or add a spam score to the message.
Who runs DrMx DNS Realtime Black List?
The DrMX Project operates the DrMx DNS Realtime Black List as a nonprofit project. The project describes its work as tracking global spam operations, providing realtime anti-spam protection for internet networks, working with law enforcement agencies to pursue spammers, and lobbying for anti-spam legislation.
How to check DrMx DNS Realtime Black List status
Check the outbound sending IP address for the mail stream that has delivery problems. For a shared email platform, that is usually the platform's sending IP. For self-hosted mail, it is the public IP that connects to recipient mail servers.
- Find the sending IP from message headers or SMTP logs.
- Reverse the octets of the IP address and append bl.drmx.org.
- A DNS answer means the IP is listed. No answer usually means the IP is not listed on that specific DNSBL.
Example DNSBL querytext
203.0.113.25 -> 25.113.0.203.bl.drmx.org
Suped's platform can track recurring blocklist (blacklist) status for sending IPs and connect the alert to the relevant domain authentication data, including SPF, DKIM, and DMARC results.
How do I get removed and delisted from DrMx DNS Realtime Black List?
If your IP address appears on the DrMx DNS Realtime Black List, confirm the exact sending IP before you request removal. The lookup tool on this page can confirm whether that IP is listed on this specific blocklist and guide you toward the relevant delisting form or policy page when available.
Fix the cause before submitting a delisting request. Review recent SMTP logs, stop compromised accounts, close open relays or open proxies, remove malware, and correct sudden sending spikes or unwanted traffic. A removal request sent before the root cause is fixed often leads to another blacklist listing.
If the listed IP belongs to a shared provider, ask the provider to handle the delisting and confirm what traffic caused the listing, because you usually cannot prove control over a shared sending IP.
What's the impact of being listed on DrMx DNS Realtime Black List?
The practical impact of being listed on the DrMx DNS Realtime Black List is low compared with more widely used enterprise DNSBLs. That does not mean it is harmless. Any blacklist (or blocklist) inclusion can hurt email deliverability when a receiving mail system checks that list. Affected mail can be rejected during SMTP, routed to spam, or assigned a higher spam score. Treat the listing as a sender reputation signal, fix the source of the abusive traffic, and monitor the IP after removal.
