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From: Wietse Venema (wietseporcupine.org)
Date: Thu Nov 01 2001 - 14:19:32 CST

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    Greg A. Woods:
    > > The RFC974 scenario above lost its strength when sendmail's
    > > Cw was introduced. Under postfix, mydestination solves the
    > > same problem.
    >
    > Those are hacks -- manual workarounds that should not be necessary. The
    > server should be able to use the DNS to figure out on its own whether or
    > not it's supposed to handle messages for a given target domain.

    Postfix needs an explicit mydestination setting, because the core
    of Postfix is not DNS (or SMTP) centric.

    Only the Postfix SMTP client and SMTP server know about DNS and
    SMTP. Most of Postfix does not talk to the network, and therefore
    most of Postfix is shielded from direct attacks from the network.

            Wietse
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