Spam Protection

• Spammers think that following smtp rules is for other people; graylisting is an elegant technique that uses their own disdain against them.
• It works to discourage spam deliveries at the (theoretically slight) cost of delaying honest mail.
• Instead, best practice would be to query one or more dnsbl and using the response as a weighting term in the isps own spam-filtering system.
• A week later, the user doesn't understand why their account has been shut down for spamming.
• Ndr spam uses a faked standard email non-delivery report (ndr) that a recipient will think is genuine, tricking them into opening an attachment that is spam.
• Spammers can send such an ndr directly or make a legitimate server send it for them, adding to its credibility.
• A program that searches web pages and filters newsgroup postings looking for valid email addresses to be used for spam purposes.
• Offshore hosts are frequently used by spammers for mail services and website hosting, since they are essentially beyond the reach of U.
• Law enforcement, may not be bound by onerous anti-spam laws, and are more willing to take on spammers' traffic for the money they can make.
• A large market for anti-spam software has been created by the demand to stop spam.
• Alternatively, the mail host can mark the message as spam so that the recipient can take action on his own.
• According to one article, spammers usually need to send a million e-mails to get fifteen positive responses, for the average direct-mail campaign, the response rate is three thousand per million.

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