It makes sense that you dont have to know the old one. Same as 'forgot password.'
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On Jan 18, 2016, at 6:35 PM, JohnF via Groups.io <email@example.com> wrote:
With Mark's new log-in-via-email-link feature, your member can just go to the login page, click the button to email a link to log in, check her email within 15 minutes, and click the link to log in. Then she can change her password in her profile. (It appears Groups.io lets you change your password without having to know the old one.)