NoSolicitado Worst Blacklist
The NoSolicitado Worst blacklist and blocklist targets severe spammers and phishing, focusing on Spanish-language email with a goal of zero false positives.
Updated on 17 Jun 2026: We updated this guide with clearer delisting steps and stronger prevention guidance for shared IP senders.
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Check if you are listed on NoSolicitado Worst Blacklist
And 143 other blocklists.
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0Spam
Cisco
NoSolicitado
URIBL
abuse.ro
ALPHANET
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Ascams
BLOCKEDSERVERS
Calivent Networks
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RV-SOFT Technology
Scientific Spam
Spamikaze
SpamRATS
SPFBL
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Team Cymru
Validity
www.blocklist.de Fail2Ban-Reporting Service
ZapBL
2stepback.dk
Fayntic Services
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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 NoSolicitado Worst Blacklist?
The NoSolicitado Worst Blacklist, with the zone name bl.worst.nosolicitado.org, is an IP-based DNS blocklist (DNSBL) for mail servers that want to reject the worst spam sources. NoSolicitado describes this zone as the stricter option for stopping severe spammers with zero false positives. A listing means NoSolicitado's mail systems have detected unsolicited email volume from the sending IP address.
This blacklist or blocklist targets IP addresses sending spam, phishing, identity theft attempts, scams, hacked-server mail, and messages that pretend to come from someone else. NoSolicitado uses spam traps: email addresses published on web pages as decoys. When a sender harvests those addresses and sends to them, that provides evidence of unsolicited activity and can lead to a listing. The list has a strong Spanish-language focus, so it can catch Spanish spam that English-focused filtering misses.
A common cause of listing is shared IP reputation. If one domain on a shared server sends unsolicited mail, the entire server IP can appear on the blacklist (blocklist), affecting unrelated domains on the same IP. NoSolicitado also states that servers with extremely poor reputations are not always removed.
Who runs NoSolicitado Worst Blacklist?
The blacklist is operated by NoSolicitado.org, a Spanish-language RBL service. NoSolicitado.org says its lists handle more than six billion DNSBL queries per month. Its stated position is that blocklists are necessary when email service providers, hosting providers, and datacenter operators do not monitor outgoing spam. The Worst zone is the stricter list for severe abuse sources, while bl.nosolicitado.org is the broader public DNSBL zone.
How do I get removed and delisted from NoSolicitado Worst Blacklist?
If you administer a server listed on this blocklist, fix the cause before requesting delisting. A review request without remediation often ends with the IP being listed again.
Before requesting delisting, take the following steps:
- Check mail logs for the account, application, script, or customer that generated the spam. Look for sudden volume spikes, repeated failed logins, web form abuse, and messages sent to harvested addresses.
- Secure any compromised account, remove malicious files, patch vulnerable software, and stop any customer or user that sent unsolicited mail.
- Correct configuration problems that make the server look unsafe. Confirm that the PTR record matches the mail server hostname, and make sure SPF, DKIM, and DMARC identify approved senders for your domain.
- Review sending practices. Use confirmed opt-in, process bounces and unsubscribe requests promptly, and remove purchased, scraped, or stale addresses.
- Document what changed before submitting the request. A concise root-cause note gives the reviewer a clearer reason to trust that the spam source has stopped.
Once the issue is fixed, use the official delisting form on the NoSolicitado website to request a review. Be specific about the root cause and what changed. NoSolicitado states that it reserves the right to ignore disputes it considers meritless.
How to reduce the chance of relisting
NoSolicitado's own guidance focuses heavily on IP reputation. The strongest prevention step is to control who shares the sending IP and to keep basic mail DNS consistent.
- Use a dedicated sending IP when business email depends on the server. This prevents another customer on a crowded shared host from damaging the same IP reputation.
- Keep the PTR record, mail server hostname, and sending domain consistent enough for receivers to identify the server. A mismatched reverse DNS setup makes a delisting request weaker.
- Monitor outbound volume and complaints by account or customer. Shared hosting and low-cost bulk sending setups need limits that stop one user from affecting everyone on the IP.
- Use DMARC aggregate reports to verify which services send mail for the domain. Suped's product can consolidate those reports so unauthorized sources are easier to find before they contribute to a blacklist (blocklist) problem.
What's the impact of being listed on NoSolicitado Worst Blacklist?
The impact is usually medium, but it rises when your recipients are in Spanish-speaking regions or when their mail servers query NoSolicitado. The Worst zone is meant for severe spam sources, so a listing can cause rejecting or filtering before the message reaches the inbox. Even if your audience is mostly outside Spanish-speaking markets, treat the listing as a sender reputation incident and fix the underlying abuse quickly.
