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I'm not opposed in principle, but I don't think the amount of work is likely worthwhile. I imagine this sets you up for weird bugs far into the future.

> - One person can have any number of email addresses. For someone who knows how, it's fairly trivial to set up a throwaway email account which cannot readily be traced back to a person, use that during the sign-up process, and then throw away the password.


This seems good enough to me. If you're concerned, it'd be easier to suggest a couple disposable email services on the sign-up page than to deal with all the corner cases of some people not having an email address.