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From: Mark Plowman (m.plowmanhexapole.com)
Date: Mon Apr 02 2001 - 09:54:58 CDT

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    Jack,

    > Date: Mon, 02 Apr 2001 10:38:52 -0400
    > From: Jack Sasportas <jackinnovativeinternet.com>
    >
    > I am seeing client unknown errors in the log file for IP numbers that
    > are set within mynetworks ie
    > mynetworks = 1.2.3
    >
    > [...]
    >
    > Apr 2 10:28:44 mars postfix/smtpd[22523]: connect from unknown[1.2.3.4]
    > Apr 2 10:28:44 mars postfix/smtpd[22523]: 589AE2761: client=unknown[1.2.3.4]

    You are not seeing client unknown *Errors*, you are seeing that the
    host name of the client with the given IP address is unknown,
    statement of fact.

    Have you by any chance, forgotten to put PTR records for you clients
    into your DNS?

    Greetings

    Mark

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