From a web browser, navigate to http://mail.cass.net

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At the login screen, login with your full email address and password.
Once logged in, on the left hand side, click on ‘Manage Mailboxes’.

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You will be presented with a list of your email accounts, click ‘Edit Mailbox’ on the one you wish to change.

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Here you can type in a new password, and then you must confirm the new password in the box below.
Once finished, click the ‘Edit Mailbox’ button to apply your changes.

See also: Tips for creating a strong password