I have some troubles to send emails to domains hosted by Google with my IPV6 connection. For gmail users, I have set a rule to send via ipv4.
But it exist domains hosted by Google. How to fix the problem ?
firstname.lastname@example.org: host ASPMX.L.GOOGLE.com[2a00:1450:400c:c00::1a] said: 550-5.7.1 [2001:bc8:344f:200::32] Our system has detected that this message does 550-5.7.1 not meet IPv6 sending guidelines regarding PTR records and 550-5.7.1 authentication. Please review 550-5.7.1 https://support.google.com/mail/?p=IPv6AuthError for more information 550 5.7.1 . a68si15272508wma.0 - gsmtp (in reply to end of DATA command)
Thanks for your tips,