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From: Wietse Venema (wietseporcupine.org)
Date: Mon Jul 02 2001 - 12:27:58 CDT

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    John:
    > I have a (hopefully) quick question: For ips that resolve to a
    > hostname
    > that doesn't resolve back to them (ie, 192.168.0.15 is
    > trusted.postfix.org,
    > but trusted.postfix.org is not 192.168.0.15), what is the access
    > restriction that would block these ips?

    Postfix ignores the host name, i.e. it gives such hosts the same
    treatment as hosts that have no reverse mapping.

    > Another question, would it be a good idea/bad idea to implement
    > this in a isp environment?

    Be prepared to lose a lot of mail. There are a lot of lazy network
    administrators who do not set up a reverse mapping. You would not
    be able to receive mail from such networks.

            Wietse
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