From: Anders Nielsen (anielsenjobindex.dk)
Date: Mon Dec 13 2004 - 09:56:35 CST

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On Mon, 2004-12-13 at 16:30, Victor Duchovni wrote:
> On Mon, Dec 13, 2004 at 04:09:50PM +0100, Anders Nielsen wrote:
>
> > We are running an email service. One of our users claim that she hasn't
> > received our mail. I found the following in the mail log.
> >
> > Dec 13 03:30:13 www postfix/smtp[19917]: 2BFC030B152:
> > to=<XXXXXpost.tele.dk>, relay=fpo.mail.dk[80.160.76.237], delay=3,
> > status=sent (0 ?221 fpo.mail.dk ESMTP server closing connection)
>
> Something seems to be missing from this log entry, normally Postfix logs
> the entire response as follows:
>
> (250 Ok: queued as D005E24B13)
>
> The log entry you show is 0<SPACE><?>221... Postfix would not have considered
> this an OK response. Please double-check the log entry, did you fail to show
> the exact text?
>

I have double checked the line and it is correct. I notice that I have
44 lines in the log from today with the same message but different
addresses on fpo.mail.dk.

> > Is seems to me that something is wrong here. Postfix says status=sent
> > but the remote server said it is closing the connection.
> >
> > It this mail dropped? How can I avoid this problem?
>
> Perhaps the remote host has a borked PIPELINING implementation...
> Turning off ESMTP with a problem domain has been described on this
> list before.
>
> To understand what really happened, add this host to debug_peer_list...

The remote server belongs to the biggest ISP and telecom company in
Denmark. They have implemented some anti-spam features recently that has
caused a lot of problems for legit mail.

It is very likely that they have a borked implementation.

Now I have added -o smtp_never_send_ehlo=yes -o smtp_always_send_ehlo=no
to the transport for this site in master.cf. Is this what you mean by
disabling ESMTP?

Thank you Victor for your fast and useful answer :-)

Anders Nielsen, Jobindex

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