[Dovecot] Limiting SSL (external) access to certain users ?

[Jakob Curdes]

I am looking for a way to limit outside access to the IMAP server to 
certain users only. Basic idea is to use two userdbs, one for SSL 
connections and one "internal" with most users in it. Is there a way to 
do this without running two dovecot configurations?

Thanks for hints,
Jakob