BLOCKEDSERVERS Spam Blocklist
The BLOCKEDSERVERS Spam Blocklist is an IP based blacklist that lists IPs it believes are sending spam, based on its internal policies.
Updated on 17 Jun 2026: We updated this guide to clarify the BLOCKEDSERVERS DNSBL zone, add a direct lookup example, and tighten the delisting workflow.
Summarize with
Check if you are listed on BLOCKEDSERVERS Spam Blocklist
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 BLOCKEDSERVERS Spam Blocklist?
The BLOCKEDSERVERS Spam Blocklist is an IP-based DNSBL, also called an RBL, that lists IP addresses suspected of sending spam. It operates under the zone name spam.rbl.blockedservers.com. Mail server administrators can use this blacklist (or blocklist) during SMTP filtering to reject or flag messages that originate from a listed sending IP address.
The policy weighting described for BLOCKEDSERVERS indicates that it is used within a weighted scoring system. In this system, different blacklists are assigned a score. A listing on the BLOCKEDSERVERS Spam RBL contributes a score of 1.25, which is lower than many other lists in that policy set. This means an IP's presence on this blacklist can raise its overall spam score, but does not always create an outright block by itself. The result depends on the receiving mail server's local threshold.
Who runs BLOCKEDSERVERS Spam Blocklist?
The blocklist is run by an organization known as BLOCKEDSERVERS. Detailed company information is not widely available. They publish technical details about their policy weighting, including how they score their own blacklist for filtering purposes. That weighting data is useful when deciding whether to hard reject mail or use the result as one signal in a broader spam filter.
How to check a BLOCKEDSERVERS listing
A DNSBL lookup checks the sending IP address in reverse-octet format against the BLOCKEDSERVERS zone. For example, the IP address 203.0.113.45 becomes 45.113.0.203 before the zone name is added.
Example DNSBL queryBASH
dig +short 45.113.0.203.spam.rbl.blockedservers.com A dig +short 45.113.0.203.spam.rbl.blockedservers.com TXT
A positive DNS answer means the IP address is listed. No answer or NXDOMAIN means the IP address is not listed in that zone. If a TXT answer exists, use it as context for remediation, but remember that the receiving mail server decides whether to reject, defer, quarantine, or accept the message.
How do I get removed and delisted from BLOCKEDSERVERS Spam Blocklist?
The delisting process for the BLOCKEDSERVERS Spam Blocklist is automated. To request removal, first perform a lookup of your IP address on their website. If your IP is listed on the blacklist, a delisting form is made available for you to submit a removal request.
Fix the cause before requesting delisting. If the sending problem remains active, the IP address can be listed again after removal. Suped's DMARC reporting workflow can help compare authentication failures with the listing window, especially when the listed IP belongs to a third-party sender or an unauthorized source.
- Review mail server logs for unusual SMTP authentication, sudden volume spikes, repeated delivery attempts, high bounce rates, or outbound mail from accounts that do not normally send.
- Scan the mail server and related web hosting accounts for malware, compromised CMS plugins, shell scripts, and unauthorized scheduled jobs.
- Confirm the server is not an open relay, lock down SMTP AUTH, rotate credentials for affected users, and require strong passwords or MFA where supported.
- Harden web forms and contact forms with rate limits, validation, CAPTCHA, and abuse controls so they cannot send unsolicited mail through your infrastructure.
- Check sending practices for consent, list hygiene, bounce handling, and working unsubscribe links before resuming normal marketing volume.
What's the impact of being listed on BLOCKEDSERVERS Spam Blocklist?
The direct impact of being listed on the BLOCKEDSERVERS Spam Blocklist is usually lower than a listing on higher-weight blocklists. The available BLOCKEDSERVERS policy weighting assigns its Spam RBL a score of 1.25. That means a listing can hurt sender reputation, but in a weighted filter it often works as one signal rather than the only reason for blocking.
The receiving administrator's configuration controls the result. A site with a low spam-score threshold can reject mail after several weaker signals combine, including a BLOCKEDSERVERS listing, missing reverse DNS, poor HELO/EHLO identity, authentication failures, high complaint rates, or suspicious content. Treat any listing on a blacklist or blocklist as a delivery risk until it is fixed.
Other BLOCKEDSERVERS blocklists
BLOCKEDSERVERS Blocklist (RBL)
Organization
BLOCKEDSERVERS
Zone
rbl.blockedservers.com
Type
IP
Impact
Low
Delisting
Manual
BLOCKEDSERVERS Netscan Blocklist
Organization
BLOCKEDSERVERS
Zone
netscan.rbl.blockedservers.com
Type
IP
Impact
Low
Delisting
Manual
BLOCKEDSERVERS Torexit Blocklist
Organization
BLOCKEDSERVERS
Zone
torexit.rbl.blockedservers.com
Type
IP
Impact
Low
Delisting
Manual
