What is safe for AAAA record. Short or full format?
I set this e.g.:
4a01:20:18:0:5:8:8:30
This is IP from mail server. But when smtp sending email out i see problems in logs. Gmail return email as spam and another server say that I have bad PTR. PTR is set correctly.
So, only one think is that correct format is
4a01:20:18::5:8:8:30
Which of these notations is correct?