What are blacklists?

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They are databases employed by antispam security devices for filtering incoming messages; they include all email addresses, IPs or domains that email is rejected from because they are not considered to be legitimate or trustworthy. Email suppliers perform this classification in collaboration with users, who can block incoming messages and censure issuer accounts that have evaded filters or not been approved. Repeated spam complaints from users can lead to a legitimate email address being added to a blacklist.

 
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