I did miss one line...
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql-virtual_mailboxes.cf
I restarted postfix, and tried, but I couldn't log in. But then I tried to send a new message with, mailx firstname.lastname@example.org
, and now it turned up in /home/vmail, and it went ok to log in, but the mail or screen was totally empty. I did add both Subject and a little message.
Anyway this was a huge result anyway. Now I need to find out why the Squirrel mail screen went blank. Not even a menu as I expected.
Thanks a lot so far