Remotly changing emil users passwords

[Ivan Wills]

Hi
I am setting up a Debian system (Woody) as primarily as mail server (exim).
Is there a way I can allow users to remotly change their passwords with 
out using ssh (or any other shell)
I world also like the majority of users, not to be able to login through 
a terminal (I don't trust their passwords and I
cannot enforce strong passwords, particularly for the CEO)

Any suggestions on how to acheive this?

Thanks
Ivan
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