[program:master]
process_name    = master
priority        = 5
directory       = /etc/postfix
command         = /usr/sbin/postfix -c /etc/postfix start
startsecs       = 0
user            = root
stopsignal      = INT

# call "postfix stop" when exiting
trap "{ echo Stopping postfix; /usr/sbin/postfix stop; exit 0; }" EXIT

# start postfix
/usr/sbin/postfix -c /etc/postfix start
# avoid exiting
sleep infinity

[program:postfix]
command=path/to/postfix.sh