Do I need PTR records for nameserver (bind dns servers)?
I understand that it's important for sending mail to have a reverse dns record in place, but as our nameservers would not send mail, is this required?
One of the servers are setup through Google Cloud, and from my understanding they do not allow PTR records to be setup for a static ip address.
When doing a check on mxtoolbox.com, I am only warned of SOA TTL which are too high and that "Could not find reverse address for ...". It however is only flagged for one of the 4 nameservers (the other 3 appears to be correct).