E-mail blacklists guarantee that the user will not receive e-mail from a certain party who is or is suspected to be a spammer. Blacklists work with various kinds of spam guards, and some block more throughly than others. The user decides who to blacklist, and unless the user is blacklisted, the software can never ban a message entirely, but send the doubtful message to a bulk folder.
However, a whitelist can refuse to allow someone entry if he or she does not enter the code correctly. Nevertheless, most are allowed another attempt and are not blacklisted unless the user initiates the action. The exception to this rule is when known spammers are barred from using internet and e-mail service from the provider. This is used as a protection for all e-mail users.
In spam filters, black lists work by allowing the user to block certain e-mail addresses or keywords in e-mails. Most e-mails that spam filters suspect as spam because they contain keywords common to spam e-mails, are filed in the bulk folder for the user to review.
Periodically, this bulk folder is automatically emptied unless the user want to keep the message. Whether the spam appears in the bulk...
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