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From: Wietse Venema (wietseporcupine.org)
Date: Tue Jan 01 2002 - 20:02:58 CST

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    Administrator [Ilustración 10]:
    > smtpd_recipient_restrictions = ...
    > check_sender_access hash:/etc/postfix/sender_access,
    > check_sender_access hash:/etc/postfix/sender_restrictions,
    > ...

    If you use check_sender_access in this way then you make yourself
    an open relay for anyone who can guess a sender address.

            Wietse
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