[outages] Google Mail rejecting IPv6 originated mails

[Job Snijders]

On Thu, May 23, 2019 at 14:18 Gert Doering via Outages <outages at outages.org>
wrote:

> On Thu, May 23, 2019 at 07:31:28AM -0400, Jared Mauch via Outages wrote:
> > Anyone else having this problem?  Their system is periodically rejecting
> mails and reporting it as invalid IPv6 PTR but there have been no changes
> in my systems, and the help pages at google do not actually provide any
> additional guidance.
>
> Google is fully intent on making people use IPv4 for SMTP delivery
> to their MXes.
>
> Lots of silly requirements that are not there on IPv4 (like, must have
> strong PTRs, SPF, DKIM, ...) - so, BCP today is "just deliver to Google
> over IPv4".


Or phrased differently “when you turn off IPv6, it works better”. :-(

Kind regards,

Job
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