There's a python script which grants permissions to your Dovecot and Postfix

database users.

.. code-block:: console

 user@host:~$ python /path/to/vmm-0.6.1/pgsql/set-permissions.py -h

 Usage: set-permissions.py OPTIONS

 Set permissions for Dovecot and Postfix in the vmm database.

 Options:

   -h, --help            show this help message and exit

   -a, --askpass         Prompt for the database password.

   -H HOST, --host=HOST  Hostname or IP address of the database server. Leave

                         blank in order to use the default Unix-domain socket.

   -n NAME, --name=NAME  Specifies the name of the database to connect to.

                         Default: mailsys

   -p PASS, --pass=PASS  Password for the database connection.

   -P PORT, --port=PORT  Specifies the TCP port or the local Unix-domain socket

                         file extension on which the server is listening for

                         connections. Default: 5432

   -U USER, --user=USER  Connect to the database as the user USER instead of

                         the default: root

   -D USER, --dovecot=USER

                         Database user name of the Dovecot database user.

                         Default: dovecot

   -M USER, --postfix=USER

                         Database user name of the Postfix (MTA)  database

                         user. Default: postfix

 user@host:~$ python /path/to/vmm-0.6.1/pgsql/set-permissions.py -a -H 127.0.0.1 -U vmm

 Password: 

 user@host:~$