کد:
Your hostname, , and the servername you have set in DirectAdmin, ns1.us-server.us, do not match. It is recommended that these two values are the same.
Solution:
Either change the servername in DirectAdmin or run the 'hostname.sh' script via ssh to change your hostname
Unable to resolve your hostname, . This will cause major issues when sending email.
Solution:
Create an A record for your hostname (.) in your DNS control panel. Point the hostname to your server's main IP address. Also check /etc/hosts to ensure that the server ip is correctly set.