Spam blocking with greylisting

Spam blocking with greylisting

Posted Jun 26, 2003 4:12 UTC (Thu) by freemars (subscriber, #4235)
Parent article: Spam blocking with greylisting

Greylisting used in connection with 'spamtrap' email addresses might work a bit better against persistant spammers. A highly simplified example:

Allow spammers to harvest 'spamtrap' email addresses, perhaps by adding them to a web page.

When mail arrives from an unknown computer it is refused for, say, 6 hours and the computer is added to the greylist. If the greylisted computer attempts to deliver mail to one of the 'spamtrap' addresses, the computer is moved from the greylist to the blacklist. If the unknown computer only attempts to deliver mail to real addresses it eventually moves from the greylist to the whitelist.

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