virtual_mailbox_maps

Hi,

how can I configure postfix/virtualmin to use the option as described in

http://www.postfix.org/VIRTUAL_README.html#virtual_mailbox

I don’t want a unix account for each mailbox.

You can’t. Virtualmin creates UNIX system users for every mailbox, and significant portions of the architecture rely on that. You can disallow shell and/or FTP logins by just choosing a shell like /bin/false or /dev/null.

Why don’t you want system users for each mailbox?