yes I have do add manually this :
sudo nano /etc/postfix/sqlite_virtual_mailbox_maps.cf
This is what should be added as the content:
dbpath = /var/vmail/postfixadmin.db
query = SELECT maildir FROM mailbox WHERE username='%s' AND active = '1'
after this restart postfix.
Than in /etc/postfix/main.cf
added this : queue_directory = /var/spool/postfix
restarted postfix and dovecot. than by running this command ls -l /var/spool/postfix/private/auth
started seeing output and mail started going out and in as well.
