before migrating to 22.04, I did a reinstall test and I had chosen the default name for the box (box.domainame). I also pointed DNS etc to do the test.
When doing the proper install, on a new fresh machine, I instead used my usual name for the box (mail.domainname).
After 6 days, then I run the STATUS page, I randomly get the below:
The nameservers set on this domain at your domain name registrar should be ns1.mail.xxxx.yy; puck.nether.net. They are currently ns1.box.xxxx.yy; puck.nether.net. If you are using External DNS, this may be OK.
Like if the box.xxxx.yy was cached somewhere…I cannot really understand where…I tried dig, nslookup etc with no luck, this is totally random
Any hint on where to look?