Critical ErrorBlacklist Removal · gbudb.com
GBUdb Truncate (Message Sniffer)

How to remove your IP from GBUdb Truncate (Message Sniffer)

GBUdb Truncate is a statistical reputation list used by Message Sniffer. IPs land on it when their traffic pattern looks overwhelmingly like spam.

Updated June 13, 2026

SMTP Exchange / Mail Log
> dig +short your-ip.gbudb.com✕ Listed on GBUdb Truncate (Message Sniffer) — mail to many recipients is being blocked or filtered  Source: gbudb.com
All guides

Is your domain affected?

Run a free check — we'll show you exactly what's misconfigured.

GBUdb Truncate (Message Sniffer) is a IP blocklist published at gbudb.com. When you're listed, mail servers that consult GBUdb Truncate (Message Sniffer)will block, defer, or spam-folder your messages — so fixing it matters for deliverability. Here's why it happened and exactly how to get off.

Why you got listed

GBUdb Truncate (Message Sniffer) listings almost always trace back to one of these:

📨
#1

A burst of spam or malware from your IP skewed its statistics

Most common

A burst of spam or malware from your IP skewed its statistics. This is the most common trigger for a GBUdb Truncate (Message Sniffer) listing — address it first.

🔗
#2

A compromised account or open relay sending in volume

Common

A compromised account or open relay sending in volume.

⚙️
#3

Very low legitimate volume from an IP that mostly sent spam

Less common

Very low legitimate volume from an IP that mostly sent spam.

How to get delisted

Delisting that lasts has two parts: fix the root cause, then request removal. Skip the first part and you'll be re-listed almost immediately.

  1. 1

    Find and stop the source

    Identify what triggered the listing — a compromised mailbox, a script or web form being abused, a poor-quality list, or a misconfigured mail server. Check your outbound logs for unusual volume and secure any account that looks compromised (rotate passwords, enable MFA, revoke stale API keys).

  2. 2

    Fix the underlying issue

    GBUdb is fully automatic and self-correcting — it has no manual removal. Once you stop the spam and send clean traffic, your IP's statistics recover and the listing clears on its own, usually within days.

  3. 3

    Confirm your authentication is solid

    Make sure SPF, DKIM, and DMARC are all passing before you ask for removal — a clean authentication setup is part of demonstrating you're a legitimate sender. Run a free EmailHealth check to confirm.

  4. 4

    Submit a removal request at gbudb.com

    Go to gbudb.com, look up your IP to confirm the listing and its stated reason, and use their removal/delisting form. Many listings here also expire on their own once the cause stops.

💡
GBUdb Truncate (Message Sniffer) is largely self-correcting: once the abusive behaviour stops and your reputation recovers, the listing clears automatically. The single best thing you can do is fix the cause and let it age out — repeatedly requesting removal without fixing the source does nothing.

Stay off it for good

  • Keep your list clean — remove hard bounces and never mail purchased or scraped addresses
  • Authenticate every sending source with SPF, DKIM, and DMARC
  • Monitor your domain so you catch a new listing within a day, not after customers complain

EmailHealth can monitor your domain daily and alert you the moment a blacklist listing (or any other deliverability change) appears.

Stop this error from coming back

Most delivery problems start when a DNS record changes, a key is removed or a domain lands on a blocklist. EmailHealth checks your sending domains every day and sends one alert, by email, Slack or webhook, with the exact fix.

1 domain free. Sending from many domains (cold email, agencies, MSPs)? Early access covers 10.

Frequently asked questions

Check your domain for free

SPF, DKIM, DMARC, MX, blocklists and TLS in about 2 seconds. No account needed.

Run the check