as far as I understood right (and as it works for me) Postfix uses virtualtransport for moving incoming mails to the Kopano dagent, which listens on Port 2003 (default).
So, in Posfix main.cf I have the following settings concerning the virtual users / transport.
virtual_mailbox_maps = hash:/etc/postfix/virtual virtual_alias_maps = hash:/etc/postfix/virtual virtual_transport = lmtp:127.0.0.1:2003
As you can see, I only use flatfile (virtual) for my mailboxes and aliases.
How does Kopano know, where incoming emails have to be assigned to? Does it check the kopano-users in kopano-db -> looking up the emailaddresses -> then assigns the incoming mail to the user with the matching emailaddress?
(I am using users which are added via kopano-admin. The users are stored in die Kopano-db)
Thanks for your answers!