On 08.06.2016 11:18, Maarten de Vries wrote: > Gmail imposes more strict checks on email coming in over IPv6, with > the rationale that IPv6 enabled machines are more modern and thus should > be configured properly for newer verification techniques. Now that is something I totally missed when I read their guidelines, but it certainly sounds like it could be the cause of these problems. I have just switched the server to deliver mails to gmail.com (only that domain, no others) via IPv4. Please tell me if you see any improvement during the next few days.
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