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From: Alex van den Bogaerdt (alex_at_ergens.op.het.net)
Date: Mon Sep 30 2002 - 06:25:50 CDT

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    On Mon, Sep 30, 2002 at 12:08:54PM +0100, Andy Tomlinson wrote:

    > We recently started using Postfix and I've noticed that we seem to be
    > getting a few external
    > clients that seem to connect, then immediately disconnect.
    >
    > Maillog reports:

    > Sep 29 22:21:11 mail4 postfix/smtpd[54057]: > unknown[212.187.187.25]:
    > 250-SIZE 5120000

    > Sep 29 22:21:11 mail4 postfix/smtpd[54057]:
    > < unknown[212.187.187.25]: QUIT
    > Sep 29 22:21:11 mail4 postfix/smtpd[54057]:
    > > unknown[212.187.187.25]: 221 Bye
    > Sep 29 22:21:11 mail4 postfix/smtpd[54057]:
    > disconnect from unknown[212.187.187.25]

    They're disconnecting after seeing the EHLO response. Their log should
    tell *why* they're disconnecting.

    I did leave the SIZE line in because of a hunch. Maybe the mail they
    try to send is larger than this. OTOH I don't see why ...

    > The attempts seem pretty persistent (about 30-40 per minute).

    ... they would try again in that case.

    HTH
    Alex
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