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295132Re: Antispam using *only* postfix/postcreen settings...

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  • Wietse Venema
    Sep 1, 2013
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      Charles Marcus:
      > If postfix is good enough now with the addition of postscreen to block
      > 95+% of spam, maybe it is time to do away with the hassle of 3rd party
      > anti-spam tools.


      1) postscreen decides if the SMTP client is a spammer.
      It makes these decisions without receiving mail.

      2) postscreen does NOT decide if the SMTP client sends spam.
      These decisions can be made only after receiving mail.

      Consider postscreen the first line in a multi-layer defense. With
      very few CPU cycles it reduces the workload for the other defenses.

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