Blacklists: The Ultimate Guide
Public email blacklists are lists of IP addresses and domains that have been reported and listed as “known” sources of spam. These blacklists are published and made available to the public – many times as a free service, sometimes for a fee. There are hundreds of well-known public blacklists, and their impact can cause a loss of money for businesses, and create a negative experience for their customers from undelivered emails.
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