$ sudo su
# mkdir -p /var/spool/kopano
# chown kopano:kopano /var/spool/kopano
# chmod go= /var/spool/kopano
# setfacl -m u:postfix:rwx /var/spool/kopano
[... Listing 8 ...]
# service kopano-dagent start
# service kopano-spooler start
# service postfix start
# exit