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• A blacklist is a list of e-mail addresses from which a user does not wish to receive mail; it may be used as part of a spam filter to hide or discard messages from addresses that appear on the list.
• Spammers employ various techniques to gather potentially-deliverable addresses for their lists: collecting them from websites or usenet groups using spambot software, testing them out on MX hosts using dictionary attacks, or simply asking users to surrender them (by offering services like electronic greeting cards, online dating, and the like).
• One advantage to dns-based blocking lists parties is that network addresses can be removed as easily as they're added.
• Without dnsbl services, system administrators are forced to manually add each new source of spam to their deny lists as they are discovered.
• The most effective approach to spam prevention is to keep off of lists where spammers might find your e-mail address.
• Whitelist: A list of known legitimate email addresses.
• Dns blocklist: A list of ip addresses which are listed for spam or spam support.
• This list may be queried in real time via the dns (domain name service).
• Despite the fairly rigorous procedures that most blocklist operators follow for naming addresses or blocks of addresses to their lists, innocent providers addresses are sometimes added.
• ) that invites you to send money to people on a list, and then add your own name to the list and forward the modified message to others (so that they can send money to you).
• A mailing list to which a mail recipient may be added without having given explicit prior consent, and from which the recipient must explicitly request to be removed, is called opt-out.

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