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From: Erwan David (Erwan.David_at_trusted-logic.fr)
Date: Wed Feb 05 2003 - 01:52:24 CST

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    Le Tue 4/02/2003, Stephen McHenry disait
    > Does anyone have any idea why postfix is issuing different error codes for
    > what appears (to me) to be the same error?
    >
    > Feb 3 17:31:50 bachelor postfix/smtpd[26775]: reject: RCPT from
    > unknown[64.46.114.164]: 450 Client host rejected: cannot find your
    > hostname, [64.46.114.164]; from=<sendermail4.unlist.net>
    > to=<memchenry.net>
    > Feb 4 01:13:48 bachelor postfix/smtpd[29512]: reject: RCPT from
    > unknown[66.129.124.179]: 554 Client host rejected: cannot find your
    > hostname, [66.129.124.179]; from=<mail2mail.play4keeps.com>
    > to=<memchenry.net>
    >
    > The first one went out with a 450, the second with a 554. The 554 I can
    > explain, since that's the code in main.cf. But, I have grepped the entire
    > postfix config directory and there isn't a 450 anywhere...

    450 means that postfix got no answer from the DNS, so it returns a
    temporary error (could be due to temporary DNS failure or transmission
    time, etc.)
    554 is returned when postfix got a negative answer from DNS. 

    -- 
Erwan David
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