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Blocking Spam Mail



Canning Spam: You've Got Mail (That You Don't Want)

Canning Spam: You've Got Mail (That You Don't Want)
Addressing everyone who uses email, the authors demystify viruses and spam, explaining how spammers gain access to email addresses, how they trick users into opening messages, and how spammers can use corporate email servers as a front for their unwanted messages. Includes practical advice for administrators setting policy and installing filters to block spam, as well as tips to help users avoid becoming part of the problem.



E-mail spam - Email spam is a subset of spam that involves sending nearly identical messages to thousands (or millions) of recipients. Perpetrators of such spam ("spammers") often harvest addresses of prospective recipients from Usenet postings or from web pages, obtain them from databases, or simply guess them by using common names and domains.

Spam and Open Relay Blocking System - SORBS (Spam and Open Relay Blocking System) is a controversial open proxy and open relay DNSBL. It has been augmented with complementary lists that include various other classes of hosts, allowing for more customized email rejection by its users.

Spam bait - Spam bait is e-mail sent in the hopes that the unwitting recipient will reply, indicating to the original sender that the recipient's e-mail address is a valid one and can be added to a mailing list for spam.

E-mail spoofing - E-mail spoofing is a technique commonly used for spam email and phishing to hide the origin of an e-mail message. This involves changing certain properties of the e-mail, such as the From, Return-Path and Reply-To fields (which can be found in the message header) to make the e-mail appear to be from someone other than the actual sender.



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Open relays, however, do not properly check who is using the mail server and pass all mail to the destination address, making it quite a bit harder to track down spammers. They do this by spoofing email addresses (similar to Internet protocol spoofing). Spoofing can have serious consequences for legitimate email users. The spammer hacks the email address owner to the next as each one is discovered and shut down by the Can Spam Act of 2003. Not only can their email inboxes get clogged up with "undeliverable" emails in addition to volumes of spam, they can mistakenly be identified as a spammer. The terms unsolicited commercial email (UCE) and unsolicited bulk email is not, in fact, also commercial; examples include political advocacy spam and chain letters. In many jurisdictions, spamming is a crime or an actionable tort, such as in the United States, where the act is regulated by the host ISPs. They also often use falsified or stolen credit card numbers to pay for these accounts. Spammers go to great lengths to conceal the origin of their messages. Spammers frequently use false names, addresses, phone numbers, and other contact information to set up "disposable" accounts at various Internet service providers. It is not possible to completely spoof an email since the actual connection from the last mailserver's IP address is recorded by your own mailserver; however, the rest of blocking spam mail.



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