Comment # 12 on bug 929471 from Thomas Blume

(In reply to Dennis Golden from comment #11)
> Created attachment 643513 [details]
> output of journalctl -axb
> 
> This is output of "journalctl -axb" after booting with
> systemd.log_level=debug.
> 
> I verified that the kernel hostname had NOT been initialized. To initialize
> required that I enter "/bin/hostname -F /etc/hostname". This is the same
> behaviour of the original bug.

I'm a bit puzzled how to reproduce this.
On my test machine, hostname -F does nothing:

-->--
linux-mgc6:~ # postconf | egrep '^myhostname|^mydomain'
mydomain = localdomain
myhostname = linux-mgc6.site
linux-mgc6:~ # cat /etc/hostname
dg-linux.golden-consulting.com
linux-mgc6:~ # /bin/hostname -F /etc/hostname
linux-mgc6:~ # hostname
dg-linux.golden-consulting.com
linux-mgc6:~ # postconf | egrep '^myhostname|^mydomain'
mydomain = localdomain
myhostname = linux-mgc6.site
--<--

It only works if I modify /etc/HOSTNAME, and then run /usr/sbin/config.postfix:

-->--
linux-mgc6:~ # cat /etc/HOSTNAME
dg-linux.golden-consulting.com
linux-mgc6:~ # /usr/sbin/config.postfix
Reading /etc/sysconfig and updating the system...
Setting up postfix local as MDA...
Setting SPAM protection to "off"...
linux-mgc6:~ # postconf | egrep '^myhostname|^mydomain'
mydomain = golden-consulting.com
myhostname = dg-linux.golden-consulting.com
--<--

The script config.postfix creates new entries in /etc/postfix/main.cf.
It looks like /etc/postfix/main.cf is unconfigured on your machine.
Maybe there was a problem at postfix installation time.
Can you please check?