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 <don(a)daedalus.co.nz> wrote:
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