What is Barracuda Reputation Blocklist?

Barracuda Reputation Block List (BRBL) is maintained by Barracuda Networks, a major manufacturer of email security appliances. Because Barracuda devices are deployed across thousands of organizations worldwide, BRBL listings have substantial real-world impact on enterprise email delivery.

Impact Level: High. Some organizations use BRBL as a primary filter ahead of other blocklists. Reports suggest it has an extremely low false positive rate, which means organizations trust it heavily for blocking decisions.

What triggers listing:

• Automatic listing: Open relays, spam proxies, and addresses hitting Barracuda spam traps are listed immediately upon detection.
• Reputation scoring: IPs passing initial checks are scored against data aggregated from Barracuda's network of anti-spam appliances. IPs consistently identified as spam sources get listed.
• User reports: Spam reported through Barracuda devices contributes to listing decisions.

How to check: Visit barracudacentral.org/lookups

Delisting process:

1. Go to barracudacentral.org/rbl/removal-request
2. Enter your IP address
3. Provide a reason for removal and explain what you've fixed
4. Wait for review (typically 12-48 hours)

Before requesting removal:

• Check for compromised accounts or scripts sending spam
• Review your authentication (SPF, DKIM, DMARC)
• Ensure you're not operating as an open relay
• Clean your mailing lists of spam traps and invalid addresses

Barracuda has deployed sentries at thousands of corporate harbors. When they sound the alarm about your ship, the gates close across an entire fleet of enterprises.