[105297] in North American Network Operators' Group
Re: SMTP no-such-user issues
daemon@ATHENA.MIT.EDU (Steve Bertrand)
Tue Jun 17 07:13:12 2008
Date: Tue, 17 Jun 2008 07:13:43 -0400
From: Steve Bertrand <steve@ibctech.ca>
To: nanog@nanog.org
In-Reply-To: <485733E9.5030008@ibctech.ca>
Errors-To: nanog-bounces@nanog.org
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
