Can't Receive Mail Using ISPConfig 3.1 on Ubuntu 18.04 Server

server.patricktoday.org or server1.patricktoday.org? Does it matter?

 

hostname is just patricktoday should I change that to server.patricktoday.org ?

 

In hosts it is not listed at all...

 

hostname = patricktoday do I change this?
mailname changed from patricktoday.org to server.patricktoday.org
host have no listing of patricktoday.org at all
main.cf is blank...
all I changed was mailname so far... Change anything else before I restart the server?

 

I am not opposed to starting with a fresh install of Ubuntu and ISPConfig... would this be a good idea? Any pointers along the way if I go this route? The reason I think this may be the way to go is because a friend tried helping me with the not being able to receive mail problem and apparently made changes to the server. I think it would be smart to start clean, since he did not put things back the way they were.

 

I did a fresh install of both Ubuntu and ISPConfig (used the install script from github). When asked "do you want to update the hostname?": I said yes and changed the host name to server.patricktoday.org. The script added patricktoday.org instead to the
/etc/mailname
/etc/postfix/main.cf
files during installation...
I changed those as suggested and removed the # as suggested. I am happy to report I can now both send and receive mail from the server. Thank you so much! You were a wonderful guide =)

 

I am actually going to test whether or not the server can still send...

 

It sends too. The messages end up in spam... Thank you again.