I have email setup with rainloop, however, it does not deliver to gmail accounts. I get a Undelivered Mail Returned to Sender that tells me:
The IP address sending this message
does not 550-5.7.25 have a PTR record setup, or the corresponding forward
DNS entry does 550-5.7.25 not point to the sending IP. As a policy, Gmail
does not accept 550-5.7.25 messages from IPs with missing PTR records.
How do I add a PTR record exactly so this issue can be fixed for gmail? Can someone please show examples with a good walkthrough on how to accomplish this. Thank you in advance.