The Barracuda Reputation Block List
The Barracuda Reputation Block List, also known as The BRBL, has been in public deployment since 2008. Barracuda Networks is a manufacturer of a hardware anti-spam appliances. Reports have been made that The BRBL is highly accurate, with an extremely low false positive rate of incident. Some are putting it ahead of their SpamHaus checks, and relying on the BRBL as their front line DNS blacklist.
Open relays, spam proxies, and spam traps are automatically listed the instant they are detected. If the IP address in question passes those basic tests, the email is then scored against The Barracuda Reputation System. This system, comprised of the shared data of many other Barracuda anti-spam appliances, will generate a score of how likely the message is to be spam. If at that point, the message is determined to be spam, the senders IP will be added to The BRBL.
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