Understanding postmarking

Postmarking is a new technique that is designed to help in the fight against spam. Postmarking a message adds to the time required to process and send it. For normal users who send dozens or even hundreds of e-mails a day, the extra time required is insignificant. For spammers who rely on being able to send millions of e-mails, however, the extra time results in an increase in costs. Therefore, a postmarked message is less likely to be spam than one that is not postmarked. Postmarks are just one of many factors that an e-mail client can take into account when filtering spam.

Phishing is a particularly dangerous kind of junk e-mail. A phishing message pretends to be from a company you do business with, for example, PayPal or eBay. The message asks you to take some seemingly legitimate action, such as resetting your password. When you follow the link to a Web site, the site looks just like the real thing, but it is not—it’s a fake Web site set up by the phisher. The result is that some unscrupulous person now has your password, and you can imagine the possible consequences.

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