Todd K Grand <tgr...@tgrand.com> wrote:

> Content-Type: message/delivery-status
>
> Reporting-MTA: dns;COL004-OMC2S2.hotmail.com
> Received-From-MTA: dns;COL129-W41
> Arrival-Date: Wed, 9 Sep 2015 02:13:28 -0700
>
> Final-Recipient: rfc822;supp...@qkstream.com
> Action: failed
> Status: 5.5.0
> Diagnostic-Code: smtp;554 The mail could not be delivered to the recipient 
> because the domain is not reachable. Please check the domain and try again 
> (-744508417:308:-2147467259)

Looks like there are some IPv6 and TCP problems with the DNS

http://dnsviz.net/d/qkstream.com/dnssec/

Tony.
-- 
f.anthony.n.finch  <d...@dotat.at>  http://dotat.at/
Viking, North Utsire: Easterly 4 or 5, increasing 6 at times. Slight or
moderate, but rough in southwest Viking. Showers later. Good, occasionally
poor later.

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