IPv6 sending guidelines regarding PTR

#1

Hi

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?

Thanks!

#2

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

#3

You rigth! :expressionless:

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

Thanks!