Setting the FQDN on Ubuntu 20.04lts

Hi,

My server is a PHP web server + BIND9 + Postfix + Dovecot. It is on a
private network using port forwarding.

There seems to be a lot of advice on the Internet...

The only solution that works for me is to add a line like this one:
"192.168.10.104 hostname.example.tld hostname" to /etc/hosts.

I used the IP of the server not the public IP that hits my router.

Does this sound right?

Thanks!!
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