Here is how to fix :
Starting httpd: httpd: Could not reliably determine the server’s fully qualified domain name.
You might get this error when restarting Apache. To resolve the issue add the following to your httpd.conf file:
The file is usually located at – /etc/httpd/conf/httpd.conf
I use the same information that is in my reverse dns to my main public server IP.
Starting amavisd: The value of variable $myhostname is “ip-10-102-202-207”, but should have been
a fully qualified domain name; perhaps uname(3) did not provide such.
You must explicitly assign a FQDN of this host to variable $myhostname
in amavisd.conf, or fix what uname(3) provides as a host’s network name!
Just edit the \etc\amavisd\amavisd.conf
Take the comment out of the $hostname line and enter the fqdn in the value.