Authentication against multiple mysql databases

Hello,

I have setup authorisation against a mysql database.

I'd now like to do (additional) authentication against another mysql database. i.e. I have two databases with usernames and passwords and I'd like allow all the users from both databases to be able to login to IMAP.

Can I simply extend 10-auth.conf in conf.d with additional !include files - like auth-sql.db1.conf.ext auth-sql.db2.conf.ext and associated filed etc.

Or do I have to create a new database and set up a view onto the other two databases / tables?

Any ideas?

Thanks, -Graham-