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AntiSpam Glossary - Blacklist

As regarding spam, blacklists are lists of known spammers, their IP addresses, and/or their ISP (Internet Service Provider). Using this information, spam filters can block all messages coming from known spammers and/or their ISPs. ISPs that fail to discipline spammers may find all email from their legitimate customers blocked by large numbers of recipients.

Read more about blacklist on SpamTitans' Knowledge Forum:

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