Filtering E-Mail with Postfix and Procmail, Part Four

    Date29 Jul 2002
    3514
    Posted ByAnthony Pell
    This is the fourth and final installment in a series on filtering e-mail with Postfix and Procmail. The first two parts of this series focused on how you can stop receiving spam by configuring Postfix for spam prevention. The third segment . . . This is the fourth and final installment in a series on filtering e-mail with Postfix and Procmail. The first two parts of this series focused on how you can stop receiving spam by configuring Postfix for spam prevention. The third segment introduced methods of stopping spam with Procmail. This installment will discuss two tools that are available for use with Procmail: Razor, an automated spam tagging and filtering tool, and SpamAssassin, a mail filter that contains hundreds of different spam tests.

    The whole theory behind spamming is to send huge numbers of messages to everyone the world over, using as little local resources as needed. The least amount of CPU and network usage occurs when you send out many identical messages. Any variation, such as custom From/To/Subject lines or message body requires additional processing which spammers would prefer to avoid.

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