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Spamhaus maintains several different RBLs, including the Spamhaus Block List SBL , the Spamhaus Exploits Block List XBL , and the Spamhaus Policy Block List PBL . The SBL list contains IP addresses of servers that are known for sending SPAM, while the XBL list contains IP addresses that are used for botnet attacks. The PBL list, on the other hand, contains IP addresses that are associated with marketing activities but do not comply with anti-spam policy standards.

Barracuda : Barracuda Networks creates network security solutions, including anti-spam Phone Number List filters. Barracuda maintains its RBL list, which contains the IP addresses of servers that are known for sending SPAM. SpamCop : This is a service that allows you to report SPAM and other unwanted messages. SpamCop contains an RBL list that is used by many spam filters to block messages from servers on the list. SURBL : SURBL is a service that scans email content for URLs that are known to send SPAM. SURBL uses various RBLs to assess whether a URL is suspicious and should be blocked.



Hint: There are also websites that allow you to check your domain's status on multiple RBL lists. The most popular of them are MXTOOLBOX and Anti-Abuse Project How do RBL spam filters work RBL anti-spam filters work by comparing the IP addresses of message senders' servers with IP addresses on the RBL list. If the sender's server IP address is listed, the message may be blocked or marked as SPAM by the anti-spam filter. The message will be flagged before it reaches the user's inbox. The operation of the anti-spam filter from RBL can be described in several steps: The mail server receives the email from the sender's server. The spam filter on the mail server analyzes the email header and verifies the IP address of the sender's server.