Can't use mail module (Ver.354 )

When I try to use Mail module:

To keep your system clean and healthy, TinyCP does not install system packages by default.                 
If you need this functionality, just install required packages.

So I try to fix modules reqs:

E-Mail Server (Postfix + Dovecot + DKIM) has "Prepare" button, but when I invoke this action, nothing happens. It says "Done", but with no effect.

Never mind. Fixed with milter service fix:

1. Change in /etc/opendkim.conf

Socket inet:8891@127.0.0.1

2. Change in /etc/default/opendkim

SOCKET="inet:8891@127.0.0.1"

3. Change in /lib/systemd/system/opendkim.service

ExecStart=/usr/sbin/opendkim -P /var/run/opendkim/opendkim.pid -p inet:8891@127.0.0.1