Remote Authentication for Mail Users

Hey everyone. Had a question about how to allow remote users (which is all of my users, except me) to set/change password for their POP3 accounts.

Running Debian on a Linode here, with Postfix and Dovecot for POP3/IMAP. For the testing stage, had simple htpasswd authentication, but the problem is that my users need to be able to set/change passwords for their accounts, and I can't provide them a command line to do so.

Any suggestions on how to best/most easily handle this? Maybe use MySQL for the accounts and then create a simple web interface to enable this?

Thanks,

Paul