: Gmail rejects mails via ipv6 as Spam Sometimes when I send from my server, I get the following response from Gmail (IP masked by me) : host aspmx.l.google.com[2a00:1450:4013:c00::1a] said: 550-5.7.1

@Cody1181609

Posted in: #Dns #Gmail #Ipv6

Sometimes when I send from my server, I get the following response from Gmail (IP masked by me)

: host aspmx.l.google.com[2a00:1450:4013:c00::1a]
said: 550-5.7.1 [2a01:**:**:**::2 12] Our system has detected that
this 550-5.7.1 message is likely unsolicited mail. To reduce the amount of
spam sent 550-5.7.1 to Gmail, this message has been blocked. Please visit
550-5.7.1 support.google.com/mail/bin/answer.py?hl=en&answer=188131 for 550 5.7.1 more information. hm5si113822760wjb.117 - gsmtp (in reply to
end of DATA command)


Some people recommended to disable IPv6 for Gmail. But google seems to miss an IPv6 PTR entry in the DNS. I found some help on this, but all this stuff is a bit above my head.

To my understanding I just have to create a PTR record for instance with the help of this tool and add that to my DNS record.

Is it that simple?

edit Some links to the Problem.

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