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• The term "blowback" describes various kinds of automatically-generated e-mail messages, including vacation messages, challenge-response notifications, MDA bounces, and other "autoresponder" mails.
• Access to the mail system from suspected spam addresses can then be slowed or temporarily suspended.
• A mail host is a computer on the internet that is dedicated to transferring e-mail from senders to recipients.
• Since the technology of usenet is considerably different from that of e-mail, the technical study of usenet spam remains largely distinct from that of e-mail spam.
• Pop (or pop3 as the improved version is usually known) is the most widely used protocol for internet mail pickup, but the imap protocol is also sometimes used.
• While some spammers may be diligent and honest, more often the remove links (an e-mail address or web link provided in a spam e-mail, ostensibly to allow recipients to remove themselves from future mailings) are simply used to verify that the complainer's address actually works and can be sent more spam.
• The mail exchanger should reject the transfer of a message outright if it can't be delivered, but some MXs send this job to the MDA.
• Since the MDA can't "reject" the mail since it's already been accepted by the MX, the best it can do is to send a bounce message back to the return-path address indicating that the mail is undeliverable.
• Spam may eventually cause the collapse of the e-mail communication system.
• If you believe that spam will always be a problem, then you might also believe that whatever replaces e-mail will also become a victim to spam.
• The actual smtp headers are normally hidden from users by their mail clients.

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