Thanks to Valerio daelli for pointing out that the names I had in my rc.conf
needed to be changed to match the actual jail name.
The jail now starts, however trying to kill it still doesn't work.
There is no error and running /etc/rc.d/jail mail stop shows
Stopping jails: mail12.
However
Doing my first jail.
I am able to start the jail manually using the jail command and using
/etc/rc.d/jail start, however I am unable to stop the jail using /etc/rc.d
jail. I get the error
Stopping jails:cannot stop jail mail. No jail id in /var/run
The name of the jail is mail.
I also tried