From: Rocco Scappatura (Rocco.Scappaturainfracom.it)
Date: Fri Apr 04 2008 - 05:58:19 CDT

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> On 4/4/2008, Rocco Scappatura (Rocco.Scappaturainfracom.it) wrote:
> > This could be OK. Anyway Im not directly connected to my Postfix. I
> > send/receive message via MS Exchange. Then MS Exchange send/receive
> > message via the Postfix SMTP Gateway. And the destination address
> > which I tried to send an email is managed by another MS
> exchange on my
> > network.
>
> Then it is your MS Exchange Server that should generate the
> NDR - if it is not, then that is where you should look to
> solve the problem.,

I saw log from MS Exchange. It appear from log that MS Exchange has
delivered the message correctly to the Postfix SMTP gateway.

On the other hand, Postfix logs show me not only the rejection from the
destination server but also a long list of retries..

Apr 4 09:38:50 av4 postfix/smtp[9922]: C663D75059D:
to=<yyyvolksbank.it>, relay=10.30.32.7[10.30.32.7]:25, delay=0.25,
delays=0.15/0/0.07/0.03, dsn=5.0.0, status=undeliverable (host
10.30.32.7[10.30.32.7] said: 550 yyydestination.it... No such user (in
reply to RCPT TO command))
Apr 4 09:38:52 av4 postfix/smtpd[14016]: NOQUEUE: reject: RCPT from
unknown[10.3.253.16]: 450 4.1.1 <yyydestination.it>: Recipient address
rejected: undeliverable address: host 10.30.32.7[10.30.32.7] said: 550
yyydestination.it... No such user (in reply to RCPT TO command);
from=<Rocco.Scappaturasource.it> to=<yyydestination.it> proto=ESMTP
helo=<srv5.stt.loc>
Apr 4 09:48:53 av4 postfix/smtpd[18653]: NOQUEUE: reject: RCPT from
unknown[10.3.253.16]: 450 4.1.1 <yyydestination.it>: Recipient address
rejected: undeliverable address: host 10.30.32.7[10.30.32.7] said: 550
yyydestination.it... No such user (in reply to RCPT TO command);
from=<Rocco.Scappaturasource.it> to=<yyydestination.it> proto=ESMTP
helo=<srv5.stt.loc>
Apr 4 09:49:54 av4 postfix/smtpd[17352]: NOQUEUE: reject: RCPT from
unknown[10.3.253.16]: 450 4.1.1 <yyydestination.it>: Recipient address
rejected: undeliverable address: host 10.30.32.7[10.30.32.7] said: 550
yyydestination.it... No such user (in reply to RCPT TO command);
from=<Rocco.Scappaturasource.it> to=<yyydestination.it> proto=ESMTP
helo=<srv5.stt.loc>
Apr 4 09:50:54 av4 postfix/smtpd[17353]: NOQUEUE: reject: RCPT from
unknown[10.3.253.16]: 450 4.1.1 <yyydestination.it>: Recipient address
rejected: undeliverable address: host 10.30.32.7[10.30.32.7] said: 550
yyydestination.it... No such user (in reply to RCPT TO command);
from=<Rocco.Scappaturasource.it> to=<yyydestination.it> proto=ESMTP
helo=<srv5.stt.loc>
.
.
.
Apr 4 10:08:08 av4 postfix/smtpd[24417]: NOQUEUE: reject: RCPT from
unknown[10.3.253.16]: 450 4.1.1 <yyydestination.it>: Recipient address
rejected: undeliverable address: host 10.30.32.7[10.30.32.7] said: 550
yyydestination.it... No such user (in reply to RCPT TO command);
from=<Rocco.Scappaturasource.it> to=<yyydestination.it> proto=ESMTP
helo=<srv5.stt.loc>
Apr 4 12:41:54 av4 postfix/smtpd[2918]: NOQUEUE: reject: RCPT from
unknown[10.3.253.16]: 450 4.1.1 <yyydestination.it>: Recipient address
rejected: undeliverable address: host 10.30.32.7[10.30.32.7] said: 550
yyydestination.it... No such user (in reply to RCPT TO command);
from=<Rocco.Scappaturasource.it> to=<yyydestination.it> proto=ESMTP
helo=<srv5.stt.loc>

Why Postfix try to send message more and more, if it rejected? And then,
why MS Exchange points out the message as delivered even if the message
is really rejected?

rocsca

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