My outgoing email stays in the que, never gets delivered. I know many people have the same problem.
BUT
Yesterday, on a freshly installed CWP7 configured a mail server. It worked perfectly, the mail-tester score was 10.0.
Then, I shut down the VPS. On a new VPS, reinstalled the same thing from scratch with new OS, exactly the same way.
Then, on the namecheap registrar, changed the ns1 and the ns2 records pointing to the new IP address. Since then already a day has passed, but the new mail server is still not working.
In the que manager it shows "Queue reason: (mail transport unavailable)"
Basically the settings, the CWP version on the two VPS servers are identical, except for the IP address.
How is it possible that mail was working on the first machine perfectly, and a day later on the new VPS doesn't?
I checked the new IP is not blacklisted.
How can I fix it?
Thanks