What is GBUdb Truncate?
DNS zone: truncate.gbudb.net
GBUdb (the "Good, Bad, Ugly database") is the IP reputation system behind ARM Research Labs' Message Sniffer filtering. Every message their network scans updates per-IP statistics, and Truncate is the exported blocklist tier: IPs whose traffic is so consistently spam that rejecting them outright is statistically safe.
Because the data is a continuously updated ratio rather than an incident log, listings self-correct. When an IP stops emitting spam, its statistics decay toward neutral and it falls off Truncate automatically. The flip side: as long as bad mail keeps flowing, no request could clear it, which is why none is offered.
How serious is a GBUdb Truncate listing?
Scoped to receivers running Message Sniffer or consuming the Truncate zone, which skews toward smaller and mid-size mail systems and appliances. Within that population the effect is a hard reject. Beyond it, the listing is a strong signal that a very high proportion of your recent output was classified as spam somewhere, which deserves attention regardless of who blocks on it.
Why your IP got listed
Sustained spam output
The statistics only reach Truncate territory when nearly everything seen from the IP is spam: a compromised sender, a spam operation, or bulk mail to overwhelmingly unengaged recipients.
A hijacked account or server
The most common story for legitimate operators: an intruder's output swamps your genuine mail in the ratio.
A recycled IP with hot history
Fresh infrastructure can inherit a Truncate record. Clean sending flushes it out through the same decay mechanism.
How to remove your IP from GBUdb Truncate
Stop the spam at the source
Audit outbound queues, rotate credentials, disinfect machines and suspend suspect campaigns. Nothing else matters until the bad flow stops, because the statistics are being updated continuously.
Let clean traffic rewrite the record
Resume (or continue) normal, legitimate sending at moderate volume. Every clean message observed by the network nudges the ratio back; silence also works, just more slowly, via decay.
Re-check over the following days
Query truncate.gbudb.net via our checker every day or two. Most records clear within days of the spam stopping.
Contact ARM Research Labs only for stuck cases
If weeks pass with verifiably clean output and the listing persists, reach out through gbudb.com with specifics. That path exists for anomalies, not as a routine delisting channel.
How long removal takes
Self-healing on the order of days: GBUdb statistics decay continuously, and an IP typically drops off Truncate within a few days to about a week after spam stops. There is no request that shortens this and no fee that bypasses it.
After delisting: the part most guides skip
Getting off GBUdb Truncate 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 request removal from GBUdb Truncate?
+
You do not: there is no delisting form. Truncate reflects live statistics, so the removal procedure is stopping the spam and letting the record decay, which typically takes days. ARM Research Labs (gbudb.com) can be contacted about anomalous stuck listings.
How long does a Truncate listing last?
+
It lasts as long as the observed spam ratio stays extreme. Once the bad mail stops, decay clears most records within a few days to a week. Continued spam holds the listing indefinitely.
What does a Truncate listing say about my mail?
+
Something blunt: of the traffic from your IP that the Message Sniffer network observed, almost all classified as spam. For a legitimate operator that nearly always means compromise. Find the hijacked account or machine before worrying about the list itself.