[Dovecot] Password changing?

[john]

Hey all, new user to the dovecot mailing list but I promise, this is a 
neat question.

Is it possible to request users change their email password through 
their email client?

I'm currently authenticating email logins to my dovecot server through 
SSL, with each users password checked against their /etc/passwd 
password.  So far, thunderbird will ask for the users new password 
(forced change at first logon,) but it fails to change the users 
password through the encrypted email connection.  Any assistance would 
be gladly appreciated.  Getting past this hurdle means i can eliminate 
one more bill gates server/money hole with a power button.


P.S. If anyone isnt using this "feature" to get users to set their email 
password, how might i ask are you getting users to change their email 
password to dovecot?


--John