What is Barracuda Reputation Block List about:
"From the Maintainers site: The Barracuda Reputation Block List (BRBL) utilizes a standard DNSBL (Domain Name System Block List) implementation that can be used to reduce spam volume on many popular email systems, including Microsoft Exchange, IBM Lotus Domino, sendmail, Postfix, and qmail, as well as by many antispam solutions such as the Barracuda Spam & Virus Firewall. DNSBL systems list IP addresses, often those that have been observed by the list operator to be sending spam or hosting spammers. By adding DNSBL entries to an email server configuration, those email servers can either reject connection attempts from listed IP addresses or use that listing to apply appropriate filtering policy.
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