Originally Posted by Grey
So as I see things, it would be necessary for Roundcube to be able to select the server according to the username given automagically. I don't have a DB dump of a v3 database at hand, but I think there has to be a connection between the mail user account and it's corresponding mailserver somewhere (has to, as ISPConfig has to know which server to make changes to mailpasswords or sth).
Perhaps no databse connection is necessary. What is if roundcube is doing a dig ns-request to locate the server and so take the correct server? This is just an idea.
If you think the database is the better solution just do it. Sorry about but i can't help a lot because iam not a programmer.