[Dovecot] Dovecot + roundcube -- Password Change

[Vijay Rajah]

Hello,

I'm using Postfix + Dovecot (2.2.6) + roundcube 0.8.x + mysql.

The roundcube webserver is hosted on a different server than the 
Dovecot. The dovecot itself is a replicated 2 node configuration.

I would like to allow users to change the password from roundcube 
interface. All the examples I have seen, assume that roundcube runs in 
the same server as dovecot.

Is there an example / documentation to enable this to work, applying 
reasonable security measures.

-Thanks
Vijay