I'm running ubuntu and aim to install an email server based on this tutorial. When I run service dovecot restart, I get this:stop: Unknown instance:start: Rejected send message, 1 matched rules; type=method_call, sender=:1.6 (uid=1000 pid=1568 comm=start dovecot ) interface=com.ubuntu.Upstart0_6.Job member=Start error name=(unset) requested_reply=0 destination=com.ubuntu.Upstart (uid=0 pid=1 comm=/sbin/init )If I try sudo service dovecot restart, I get this:stop: Unknown instance:dovecot start/running, process 1591I cant find the dovecot log file ; if it is the /var/log/mail.log  file there is nothing special in there:Sep 20 12:27:48 ubuntu postfix/master[1213]: daemon started -- version 2.11.0, configuration /etc/postfix
Dovecot not restarting
ubuntu;postfix;dovecot