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SMTP, the "Simple Mail Transfer Protocol", has formed the backbone for e-mail transfer for more than 20 years. If you send e-mail, you certainly send it over SMTP. It is one of the most important protocols on the Internet, and therefore one of the most common to be attacked by ahckers. The most important problem administrators need to worry about on SMTP services is spam relay. See anti-spam countermeasures for more information.
- Anti-spam@
How to stop spammers from compromising your system
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Some ways that people can attack an SMTP service
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