Miguel Da Silva - Centro de Matemática wrote:
Dear users, I'm quite suprised seeing this kind of messages at the mail
server:
Aug 29 17:19:31 mordred postfix/smtpd[23160]: connect from
fder1.fder.edu.uy[164.73.178.2]
Aug 29 17:19:32 mordred postfix/smtpd[23160]: setting up TLS connection
from fder1.fder.edu.uy[164.73.178.2]
Aug 29 17:19:32 mordred postfix/smtpd[23160]: TLS connection established
from fder1.fder.edu.uy[164.73.178.2]: TLSv1 with cipher
DHE-RSA-AES256-SHA (256/256 bits)
Aug 29 17:19:32 mordred postfix/smtpd[23160]: NOQUEUE: reject: RCPT from
fder1.fder.edu.uy[164.73.178.2]: 450 4.1.1 <[EMAIL PROTECTED]
.edu.uy>: Recipient address rejected: undeliverable address: unknown
user: "wferrer"; from=<[EMAIL PROTECTED]> to=<[EMAIL PROTECTED]
.edu.uy> proto=ESMTP helo=<fder1.fder.edu.uy>
Aug 29 17:19:32 mordred postfix/cleanup[23315]: AEAAC131057:
message-id=<[EMAIL PROTECTED]>
Aug 29 17:19:32 mordred postfix/qmgr[10250]: AEAAC131057:
from=<[EMAIL PROTECTED]>, size=267, nrcpt=1 (queue active)
Aug 29 17:19:32 mordred postfix/local[23139]: AEAAC131057:
to=<[EMAIL PROTECTED]>, relay=local, delay=0.01, delays=0/0/0/0, dsn
=5.1.1, status=undeliverable (unknown user: "wferrer")
Aug 29 17:19:32 mordred postfix/qmgr[10250]: AEAAC131057: removed
First, a remote serve tries to send a mail to an unknown user and the
server reject it. That's ok and I do remember configuring Postfix to do
this.
But then, the local server (postmaster) tries to send a message to the
same user. At the 17:19:32 it was the very first time the id AEAAC131057
appears, so this message is somehow related with the other coming from
the remote server.
Any suggestions?! Maybe I'm reading the logs the wrong way.
Greetings.
Do you remember reading this
http://www.postfix.org/ADDRESS_VERIFICATION_README.html#recipient
and adding "reject_unverified_recipient" somewhere in your
main.cf?
The message sent from postmaster to the unknown user is the
verification probe. The clue is "status=undeliverable" or
"status=deliverable" is only logged by verification probes.
As a side note, consider setting in your main.cf:
unverified_recipient_reject_code = 550
to permanently reject unknown recipients, rather than telling
the remote mail server to retry again and again.
http://www.postfix.org/postconf.5.html#unverified_recipient_reject_code
--
Noel Jones
