IPv6 Reverse DNS - gmail rejects


When i try send email from my me@domain.com to a gmail account, i obtain this message:

host gmail-smtp-in.l.google.com [2a00:1450:400c:c07::1a]
SMTP error from remote mail server after end of data:
550-5.7.1 [2001:19f0:7402:663:5400:1ff:fe39:cb19] Our system has detected that
550-5.7.1 this message does not meet IPv6 sending guidelines regarding PTR
550-5.7.1 records and authentication. Please review
550-5.7.1 https://support.google.com/mail/?p=IPv6AuthError for more information
550 5.7.1 . r126si2702708wmd.76 - gsmtp

Can someone help me set up the reverse dns?

In the IPv6 configuration section, what do I have to put in the IP and Reverse DNS fields?

Thank you


  • IP: 2001:19f0:7402:663:5400:1ff:fe39:cb19
    Reverse dns: yourservername.yourdomainname.com (e.g.)

    Also, make sure your forward DNS for yourservername.yourdomainname.com has an AAAA record pointing to 2001:19f0:7402:663:5400:1ff:fe39:cb19
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