Based on symptoms that is exactly the case.
-----Original Message-----
From: nznog-bounces(a)list.waikato.ac.nz
[mailto:nznog-bounces(a)list.waikato.ac.nz] On Behalf Of Pete Mundy
Sent: Wednesday, 17 October 2012 6:51 p.m.
To: NZNOG(a)list.waikato.ac.nz
Subject: Re: [nznog] Xtra mail admins around?
Is it possible that their MTA's configuration treating the domain as valid
for local-delivery would mean the problem is still experienced by users who
relay their outbound through said MTA, regardless of the state of DNS?
Pete Mundy
On 17/10/2012, at 6:47 PM, Don Stokes
If they properly separated their authoritative name service from their caching forwarders, this wouldn't be a problem. The change in delegation would mean nobody ever saw the old records ever again after the TTLs expired.
This has been "best practice" since the late '90s, FFS.
-- don