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From: Wietse Venema (wietseporcupine.org)
Date: Mon Dec 03 2001 - 12:34:46 CST

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    Austad, Jay:
    > So why would I get a "502 Command not implemented" error after doing a MAIL
    > FROM:? It's intermittent, like one out of every 30 times or so. Should I
    > upgrade to the 20011125 snapshot?

    That's a remote bug.

    The Postfix SMTP client has not changed in a long time, except for
    adding PIX firewall workarounds.

    Microsoft Exchange seems to be unable to implement ESMTP command
    pipelining correctly.

    Perhaps another trigger and workaround? If this keeps happening then
    it might be worthwhile to make this table driven, i.e.

            /pattern/ option, option, ...

    where options are nopipelining, noesmtp, and so on.

            Wietse
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