What is 0spam BL?
DNS zone: bl.0spam.org
The 0spam Project maintains DNS blocklists (its primary IP zone answers at bl.0spam.org) built from spam received by its trap network and participating mail systems. When spam is observed from an IP, the address is listed; the project also maintains related zones for URLs and domains observed inside spam.
It is a smaller operation than Spamhaus or SpamCop, with the typical profile of an independent DNSBL: automated listings on evidence, a self-service lookup on the project website, and a removal-request flow that feeds a re-check rather than a promise.
How serious is a 0spam BL listing?
Limited but nonzero. 0spam appears in the query sets of various small mail servers and multi-list scoring filters. You are unlikely to see mass bounces from a 0spam listing alone, but it contributes to composite spam scores, and a listing corroborated by other trap-based lists (PSBL, SpamCop) confirms a genuine list-hygiene problem.
Why your IP got listed
Spam-trap deliveries
Mail from your IP reached addresses in the 0spam trap network, which means your list contains addresses without a valid opt-in trail.
A compromised sender
Hijacked mailboxes, leaked SMTP credentials or exploited web forms emitting spam from your IP.
Bulk sending that looks like spam
High-volume mail to unengaged recipients can trip filter-side detections even without a classic trap hit.
How to remove your IP from 0spam BL
Verify the listing at 0spam.org
Use the project's own lookup to confirm the IP is currently listed and in which zone. Checking there first also confirms the site's current removal procedure.
Stop the offending mail
Audit sending from the listing window, cut acquired or stale list segments, and rule out compromise by rotating credentials and checking outbound queues.
Submit the removal request on 0spam.org
The site provides a delisting request form for listed IPs. Submit after the cleanup with accurate contact details. Requests are processed against fresh evidence: if traps are still being hit, expect refusal or relisting.
Re-check within a few days
Confirm removal via their lookup and ours. A returning listing means the source is still live, and step 2 needs another pass.
How long removal takes
Removal requests at smaller projects like 0spam are typically processed within a day or a few days. There is no paid express lane and no need for one. As with all trap-driven lists, the durable timeline is set by your list hygiene, not by the form.
After delisting: the part most guides skip
Getting off 0spam BL removes a block; it does not restore trust. While you were listed, mailbox providers were accumulating their own negative signals about your domain (bounces, spam-folder placements, dropped engagement), and those persist after the listing clears. If placement does not bounce back within a couple of weeks, the domain needs a structured re-warming: reduced volume, genuinely engaged recipients and clean authentication, sustained until providers trust the domain again.
Frequently asked questions
How do I get delisted from 0spam?
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Fix the source of the spam first, then submit the free removal request via the lookup on 0spam.org. The project re-checks against its trap data, so removal sticks only when the offending mail has genuinely stopped.
How much does a 0spam listing hurt deliverability?
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On its own, modestly: it mainly adds points in multi-list scoring filters used by smaller receivers. Its bigger value to you is diagnostic. Trap-based listings rarely fire on genuinely clean, opted-in mail streams.
Why did my IP end up on bl.0spam.org?
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The project's traps or filtering network received spam from your IP. The usual suspects are purchased or stale lists containing trap addresses, or a compromised account relaying spam through your infrastructure.