- Operator
- The 0spam Project
- Zones
- bl.0spam.org, rbl.0spam.org, nbl.0spam.org, dbl.0spam.org
- Lists
- IP addresses and domain names
- Status
- Active
- Severity
- Standard
- Lookup
- 0spam.org
- Removal
- self-service form for bl (1 IP per 3h); rbl/nbl automatic only: 0spam.org/request
- Cost
- free (enterprise tier for high query volume)
- Turnaround
- rbl auto-clears within 24h; nbl after the whole /24 clears; stale bl entries need 60+ clean days
- Auto-expiry
- 24h (rbl)
- Source
- The 0spam Project: 0spam
What is 0spam?
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.
| 127.0.0.1 | Listed: Spam source |
How serious is a 0spam 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
- 1
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.
- 2
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.
- 3
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.
- 4
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.
- 01Look it up0spam.org
- 02Fix the causebefore you ask
- 03Self-service removal0spam.org/request
- 04Verifyrbl auto-clears within 24h
cost: free (enterprise tier for high query volume)
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.
Frequently asked questions
How do I get delisted from 0spam?
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?
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?
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.
Record checked against the operator's site on ; the whole set was last reviewed on . Cells that say undocumented or not found are gaps in the operator's own material, left as they are.