How to remove your IP from Barracuda (BRBL)

The BRBL is a widely used free DNSBL run by Barracuda Networks. Here is what a listing means and how to get your IP removed.

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What it is

The list, in plain terms.

The Barracuda Reputation Block List (BRBL) is a free, IP-based DNS blocklist operated by Barracuda Networks through its Barracuda Central threat-intelligence team. Receiving mail servers query the zone b.barracudacentral.org to decide whether to reject or defer a connecting IP, and the list is consulted by Barracuda appliances and by many third-party mail systems such as Postfix, sendmail, Exchange and qmail.

Listings are generated automatically. Barracuda Central collects sending reputation from a global network of honeypots and spam traps rather than by manual submission, so an IP is added because of the traffic seen from it, not because someone reported you. If your address appears on the BRBL, your mail can be blocked at a meaningful share of receivers until you fix the cause and the listing clears.

The BRBL is free to query, but Barracuda asks operators to register the IP address they run lookups from. Unregistered query sources can be rate-limited or blocked, so this list matters mostly for the deliverability of your own outbound mail rather than as something you run yourself.

Why you get listed

What a listing on Barracuda (BRBL) means.

Spam-trap and honeypot hits Your IP sent mail to addresses that exist only to catch spam. These traps never opt in, so hitting them signals poor list hygiene or purchased or scraped recipients.

A compromised host or account A malware infection, a hijacked mailbox or a stolen SMTP credential is sending spam from your IP. The reputation system sees the abusive traffic and lists the address.

An open relay or misconfigured server A mail server that relays for anyone, or one leaking mail through a bad configuration, gets used by spammers and picks up a poor reputation.

Sudden or anomalous sending behaviour A sharp volume spike, high complaint rates or patterns typical of bulk unsolicited mail can push an IP onto the list.

How to get removed

Delisting, in order.

Removal is free. Fix the cause first — a listing you clear without a fix comes straight back.

1 Confirm the listing. Query the IP against the zone: a listed address returns an A record of 127.0.0.2 (TTL 900), while a clean address returns NXDOMAIN. You can also use the lookup tool on barracudacentral.org to confirm before you do anything else.
2 Find and fix the cause first. Clean any malware, close an open relay, rotate compromised SMTP credentials, and purge unverified or scraped addresses from your lists. The BRBL is automated, so if the abusive behaviour continues you will be relisted after removal.
3 Submit the free removal request. Open the Barracuda removal-request form and enter your mail server's IP address, your email address and a phone number. These three fields are required. Removal is free and there is no charge at any stage.
4 Give a clear, honest explanation. The optional reason field is what gets requests processed quickly. State what you found and what you fixed, for example rotating a compromised credential and removing addresses imported in error. Requests without valid information are ignored.
5 Submit once, then re-check. Do not send duplicate requests; multiple submissions are ignored. Wait for the investigation to complete, then re-query the IP to confirm it now returns NXDOMAIN before resuming normal sending.

The official route

Straight to the source.

Removal happens on Barracuda (BRBL)'s own tool — never through a paid service.

Barracuda (BRBL) removal tool ↗

Return codes

127.0.0.2 IP is listed on the BRBL (A record, TTL 900)

NXDOMAIN IP is not listed — no record returned

How long it takes

Barracuda states that removal requests are typically investigated and processed within 12 hours of submission when accompanied by a valid explanation. Allow a little longer for DNS to propagate before you re-test. A weak or missing explanation slows the request or gets it ignored, and duplicate submissions are ignored, so submit once and wait.

Common questions

About Barracuda (BRBL), specifically.

Does Barracuda charge to remove my IP? No. Removal from the BRBL is free through the official removal-request form on barracudacentral.org. Any third party charging a fee for "instant" Barracuda delisting is not affiliated with Barracuda and cannot influence the outcome.

How long does Barracuda removal take? Barracuda says requests are typically investigated and processed within 12 hours of submission if you provide a valid explanation. Allow extra time for DNS to propagate, then re-check the IP before resuming sending.

How do I know my IP is on the BRBL? Query the reversed IP against b.barracudacentral.org, or use the lookup tool on barracudacentral.org. A listed IP returns the A record 127.0.0.2; a clean IP returns NXDOMAIN.

Why was I listed if I never sent spam? The BRBL is automated and built from honeypot and spam-trap data. A compromised mailbox, a stolen SMTP credential, an open relay or poor list hygiene can send abusive mail from your IP without your knowledge, and the reputation system lists the address on that traffic alone.

I was removed but got listed again — why? Because the underlying cause was still active. The list is regenerated automatically, so if the malware, open relay or bad sending continues, the IP returns to the list. Fix the cause permanently before requesting removal.

Should I submit the request more than once to speed it up? No. Barracuda ignores multiple requests for the same IP, and it ignores requests without valid information. Submit a single, well-explained request and wait for it to be processed.

The bounce behind the listing.

554 5.7.1 message rejected → The permanent bounce a listing most often triggers — what it means and how to clear it. 550 5.7.1 blocked → A rejection on reputation grounds — usually the same listing, seen from the sender side. Blacklist checker → Re-check your domain and every sending IP once the cause is fixed.

Do not fix it blind.

See every list you are on and every authentication problem behind the listing in one 40-second check — then let monitoring tell you the day a listing comes back.

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