[105300] in North American Network Operators' Group
RE: SMTP no-such-user issues
daemon@ATHENA.MIT.EDU (Frank Bulk - iNAME)
Tue Jun 17 08:39:52 2008
From: "Frank Bulk - iNAME" <frnkblk@iname.com>
To: "'Steve Bertrand'" <steve@ibctech.ca>,
<nanog@nanog.org>
In-Reply-To: <48579C67.7000209@ibctech.ca>
Date: Tue, 17 Jun 2008 07:39:29 -0500
Reply-To: frnkblk@iname.com
Errors-To: nanog-bounces@nanog.org
Please share a packet capture of a working and not working SMTP exchange.
Frank
-----Original Message-----
From: Steve Bertrand [mailto:steve@ibctech.ca]
Sent: Tuesday, June 17, 2008 6:14 AM
To: nanog@nanog.org
Subject: Re: SMTP no-such-user issues
Steve Bertrand wrote:
> Hi everyone,
>
> We are experiencing an issue in regards to SMTP MTA relay responses
> regarding 'no such user', and it *apparently* appears to be only
> occurring when a particular site attempts to deliver email to us. Any
> advice on how to further troubleshoot my issue would be greatly
> appreciated.
Because I have been inundated with off-list replies, I'll post my
findings here.
First, a screen cap of me composing a message, in which two of the
addresses are easily identified as valid, and two are clearly not:
http://ibctech.ca/nanog_smtp/hotmail_compose.jpg
...when I sent it, I received thus:
http://ibctech.ca/nanog_smtp/hotmail_response.txt
So, we'll try it from a different server:
http://ibctech.ca/nanog_smtp/local_compose.jpg
...hmmm, I received the message at steveb@eagle.ca (even though the To:
field was cropped out of the jpg) this time, and my server generated the
following....AFAICT, correct 551 error(s):
http://ibctech.ca/nanog_smtp/local_err.txt
I'm willing to provide any more documentation required in order to get
this issue sorted.
Thank you everyone, I truly appreciate it.
Steve
