postfix starting before network

[Tom Horsley]

I gave up trying to analyze stuff like this soon after
systemd appeared, I just have a bunch of things in
my /etc/rc.d/rc.local file to restart various
services after a brief delay. Things like:

/bin/bash -c 'sleep 5 ; service stunnel restart' > /dev/null 2>&1 < /dev/null &
/bin/bash -c 'sleep 7 ; service postfix restart' > /dev/null 2>&1 < /dev/null &
...

All things which at one time or another failed to
start correctly, and I also have the opposite - a
script to fix things before actually rebooting
so systemd won't hang forever at reboot:

https://bugzilla.redhat.com/show_bug.cgi?id=1088619#c23