One of Roundcube's extensions is the 'password' plugin which allows the logged user to change his mail password. Several solutions exist, e.g. to change the password via a SQL query, via LDAP, chpasswd, and so on. In this case the goal is to change the password of a user managed by Confixx and where the email account's password usually only could be changed by the Confixx user.
The new HowTo 'Change Confixx email account password in Roundcube' explains step-by-step how to activate the plugin and which sql statements to use to succeed in this. Enjoy and have a good weekend.