Is this valid only during join? Or is it in effect also after the join process (i.e: when current members modify their profile or change their email address)?
Once you're validated, there should be no reason to limit which email is used, except maybe if it's a corporate site and they wanted email addresses restricted to the corporate email domain for privacy/security reasons (which I think would be an edge case).
Exactly. I thought it was worthwhile to allow admins to edit it to something freely, but I didn't think it was worthwhile to introduce a privilege to decide who could do that (bloat).
(Click to enlarge)
(Click to enlarge)
My thinking is that this feature is for security, stopping external people being allowed to get into the site.
Do you think it needs doing for account editing also?
Once you're validated, there should be no reason to limit which email is used, except maybe if it's a corporate site and they wanted email addresses restricted to the corporate email domain for privacy/security reasons (which I think would be an edge case).