Could you please point me at correct documentation on which PTR for IPv6 I should configure?
I’ve just nstalled latest mailcow on Hetzner and receive next error while trying to deliver my messages to gmail:
: host gmail-smtp-in.l.google.com[2a00:1450:4010:c0d::1b]
said: 550-5.7.1 [2a01:4f9:c010:34b8::1] 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 . m9si3386937ljj.493 - gsmtp (in reply to end of DATA command)