[Mimedefang] Mail Admin Question

Ben Kamen bkamen at benjammin.net
Tue Aug 28 14:19:00 EDT 2012

On 2012-08-28 1:08 PM, Michael D. Sofka wrote:
> 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.

Mike, that's a most excellent observation|tech tip!



Ben Kamen - O.D.T., S.P.
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