IPv6 sending guidelines regarding PTR


I’m having a lot of problems with Gmail. Some email can’t be delivered:

gmail-smtp-in.l.google.com[2a00:1450:4013:c01::1b] said:
[2a01:7c8:d001:139:5054:ff:fec0:769e] Our system has detected that
this message does not meet IPv6 sending guidelines regarding PTR
records and authentication. Please review
https://support.google.com/mail/?p=IPv6AuthError for more information. by17si6234894ejb.604 - gsmtp (in reply to end of DATA command)

Any help on this?


Sounds like you’re not sending from our SMTP servers. We don’t send over IPv6 at this time, and the IP 2a01:7c8:d001:139:5054:ff:fec0:769e belongs to an ISP that appears to have no relation to us: 2a01:7c8:d001:139:5054:ff:fec0:769e - bgp.he.net

You rigth! :expressionless:

So silly, I made some tests last month and forget to change to SMTP!