[Mimedefang] Mail Admin Question

Michael D. Sofka sofkam at rpi.edu
Tue Aug 28 14:08:34 EDT 2012

On 08/14/2012 12:19 AM, Nathan Findley wrote:
> The server in question is returning:
> Aug 8 11:52:18 asp sendmail[13710]: q772pt1H016314:
> to=<*******@*****.co.jp>, delay=1+00:00:21, xdelay=00:00:00,
> mailer=esmtp, pri=129960390, relay=mail.*****.co.jp. [IP], dsn=4.0.0,
> stat=Deferred: Connection reset by mail.*****.co.jp.
> This deferred error message is new to me. Based on the domain, I have
> sent mail to the supposed administrators asking them for help on their
> end. They have yet to reply, unfortunately.
> Is there anything else I can do?

You might be on the sending end of the Cisco DKIM bug.  If the receiving 
site is using a Cisco router, the rules to check DKIM in e/smtp may be 
enabled (they are by default).  The implementation is buggy and will 
reject some small number of messages, while allowing others through. 
The error will be consistent for the message, but other email from the 
same MTA and sender is accepted.  It does not appear to have anything to 
do with message size.

If the message you are sending has DKIM keys, try sending them without. 
  If you are in contact with the admin, see if they are using Cisco 
routers, and if the DKIM rules are enabled.


Michael D. Sofka               sofkam at rpi.edu
C&MT Sr. Systems Programmer,   Email, HPC, TeX, Epistemology
Rensselaer Polytechnic Institute, Troy, NY.  http://www.rpi.edu/~sofkam/

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