[AusNOG] [nznog] heads up.. gmail now checking ipv6 rdns

[Jeremy Visser]

On 27 Jan 2014, at 11:55 am, Ted Cooper <ausnog0809d at linuxwan.net> wrote:
> There have been issues with it though as periodically google will fail
> to lookup the PTR record at all, cache that failure, and hard reject all
> emails from the server for a number of hours. There doesn't seem to be a
> sending server side fix for this.

I’ve encountered this a few times.  I’ve periodically had customers forward me these bounce messages from Google complaining about missing IPv6 rDNS when I *know* I have set it up correctly.

Typically resending an e-mail after an hour or so makes it happy.

I’d be most likely to point the finger at DNS resolution issues (quite possibly on my end, but as I’ve never been able to reproduce the issue, it’s guaranteed to go unfixed).