Thanks. I have OCD when it comes to things like this, I need all green ticks otherwise I can’t move on.
I’ve been going through that page again and again and again. Maybe I need a break and come back to it later.
From what I can work out, I need to add the PTR part to Hetzner and not at the domain provider?
I’ve added the Reverse DNS mail.mydomain.co.uk for ipv4.
I’ve then added ::1 in the address box and mail.mydomain.co.uk in the Reverse DNS box for ipv6 as per the instructions in the text below. I’m not sure if I should have a green tick of that section but the current state now has some text in it that matches the name for the ptr record. Is that now correct?
I found this page: https://community.hetzner.com/tutorials/setup-mailserver-with-mailcow
and read this section…
Step 6 - Set up the reverse DNS entries
To set up your reverse DNS entries, do the following steps:
Go to the Hetzner Cloud console and click on your project
Select the server you just created and go to the NETWORKING tab
Click the three dots near your IPv4 address, select Edit Reverse DNS, enter your domain (mail.example.com), and confirm the change.
Click the three dots near your IPv6 subnet, select Edit Reverse DNS, and type ::1 into the field where the IP is below your domain name (mail.example.com).