Yawn.
Been there, done that.  Why do you think the other public mail services have 
switched over so quickly ? :)

This is exclusively a gmail problem.


On Saturday, 10 August 2024 at 15:28, Suresh Ramasubramanian 
<ops.li...@gmail.com> wrote:

> Look at it this way, anywhere that has resolvers forwarding to other 
> resolvers that forward to yet another set of resolvers before the query gets 
> to the root servers (anywhere with a complex network and multiple layers of 
> firewalling) will have a succession of caches that need to clear .. so might 
> take somewhat longer than whatever TTL you set.  The recommendation therefore 
> is to lower the TTL for a few days BEFORE you change your DNS records.
> 
> --srs
> 
> From: NANOG <nanog-bounces+ops.lists=gmail....@nanog.org> on behalf of Laura 
> Smith via NANOG <nanog@nanog.org>
> Sent: Saturday, August 10, 2024 7:46:31 PM
> To: nanog@nanog.org <nanog@nanog.org>
> Subject: Any ideas how long gmail cache DNS records ?
> 
> In typical "Google knows best" style they appear to be ignoring SOA and TTL 
> and doing their own thing.
> 
> Changed DNS severs and MX records, other public mail services have picked it 
> up no problem.
> 
> Gmail however appear to be insisting on continuing to deliver to the old mail 
> servers for god knows how much longer ?
> 
> Any ideas how long I can expect this to go on for before they Do The Right 
> Thing (TM) ?

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