Overview

The Barracuda Reputation Block List (BRBL) is based on Barracudas system and operates collaboratively to fight spam. The automated spam trap, collection and rating system automatically adds IP addresses to the list when spam is detected.

Impact

Listing happens on an IP level and pretty low impactful to delivery. However if traffic is concentrated more B2B you have a higher chance of having delivery impacted.

Listing Reason

When email is received, the connection is automatically analyzed to determine if the connecting machine is either an open proxy or a node in a spam-generating botnet. If either is true, the IP address is immediately added to the Barracuda Reputation Block List (BRBL).

Most IP addresses are listed as a result of directly sending spam or viruses to the Barracuda Reputation System's detectors. The Barracuda Reputation System detects spam by using honeypots, special addresses created to receive only spam and do not belong to any real user and through analysis of captive spyware protocol activity.

Mitigation Process

Barracuda allows direct removal requests to be made on their site. Be sure to review your traffic prior to removal request to prevent your IP from getting blocked again.

Need Support?

Our Support Team here at Sinch Mailgun is happy to help! Reach out to us in the Support page of your Mailgun Control Panel, and we'll be with you shortly!