Hello everybody,
A software we use in house is sending e-mails that are processed by postfix
which relays them to an exchange server that has a connection to the internet
(unlike the sending server).
Recently, the admin of the exchange server forwarded me the following error
message our server is causing:
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The client at "10.xxx.xxx.xxx" sent a "rcpt" command and the SMTP server
responded with "501 5.5.4 Invalid
Address ". The full command sent was "rcpt TO:<""@domain.com>
ORCPT=rfc822;""@domain.com". This will probably
cause the connection to fail.
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In order to find out what messages were causing this, I had them deliver to a
local mailbox. Here how ist headers are looking like:
-------------------------------------------------------------------
From ""@domain.com Tue Oct 13 13:53:47 2009
Return-Path: <""@domain.com>
X-Original-To: iselie
Delivered-To: ise...@internal.domain.com
Received: from domain.com (internal [10.xxx.xxx.xxx])
by internal.domain.com (Postfix) with SMTP id 0F3A4D2579
for <iselie>; Tue, 13 Oct 2009 13:53:47 +0200 (CEST)
From:Name <usern...@domain.com>
To: <ise...@internal.domain.com>
Subject:Topic of mail
Date: Tue, 13 Oct 2009 11:53:47 0
MIME-Version: 1.0
Content-Type: text/plain
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: SOME-CUSTOM Mailer
X-MimeOLE: Produced By SOME-CUSTOM Mime
Message-Id: <20091013115347.0f3a4d2...@internal.domain.com>
-------------------------------------------------------------------
Now this confirms the error message coming from the exchange server. However
things are not that simple. I then asked Postfix to keep the message internally
with the following changes in header_checks
/From: ....@domain\.com/ HOLD
/To: ....@domain\.com/ HOLD
I then had a look at the messages kept in /var/spool/postfix/hold with postcat
and I couldn't believe my eyes: actually postfix must be mangling something
since the "from"-address is absolutely correct! Does anyone see why postfix
removes the username from the from-information and just sends an empty string?
Note that some mails actually do get through so it's not an overall problem. Is
there a mistake in the format the "SOME-CUSTOM Mailer" is generating? If yes,
can anyone point me to the specification so that I can get in touch with the
company?
-----------------------------------------------------------------------------
*** ENVELOPE RECORDS 08192D2576 ***
message_size: 682 551 1 0
message_arrival_time: Tue Oct 13 12:05:51 2009
create_time: Tue Oct 13 12:05:51 2009
named_attribute: rewrite_context=local
sender: @domain.com
named_attribute: log_client_name=internal
named_attribute: log_client_address=10.xxx.xxx.xxx
named_attribute: log_message_origin=internal[10.xxx.xxx.xxx]
named_attribute: log_helo_name=domain.com
named_attribute: log_protocol_name=SMTP
named_attribute: client_name=internal
named_attribute: reverse_client_name=internal
named_attribute: client_address=10.xxx.xxx.xxx
named_attribute: helo_name=domain.com
named_attribute: client_address_type=2
named_attribute: dsn_orig_rcpt=rfc822;my.addr...@domain.com
original_recipient: my.addr...@domain.com
recipient: my.addr...@domain.com
*** MESSAGE CONTENTS 08192D2576 ***
Received: from domain.com (internal [10.xxx.xxx.xxx])
by internal.domain.com (Postfix) with SMTP id 08192D2576
for <my.addr...@domain.com>; Tue, 13 Oct 2009 12:05:51 +0200 (CEST)
From:Name <usern...@domain.com>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
To: <my.addr...@domain.com>
Subject:Topic of mail
Date: Tue, 13 Oct 2009 10:05:51 +0000
MIME-Version: 1.0
Content-Type: text/plain
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: SOME-CUSTOM Mailer
X-MimeOLE: Produced By SOME-CUSTOM Mime
Message-Id: <20091013100551.08192d2...@internal.domain.com>
Message Body
*** HEADER EXTRACTED 08192D2576 ***
*** MESSAGE FILE END 08192D2576 ***
-----------------------------------------------------------------------------
Thanks a lot for your insights.
Regards,
Erich
P.S. I'm running postfix-2.3.3 on RHEL 5
