Some users capitalize their email address, and they expect to see it capitalized. I think a better solution would be to use a case insensitive collation on the

Some users capitalize their email address, and they expect to see it capitalized. I think a better solution would be to use a case insensitive collation on the database for the email column. If the user changes the capitalization of their email, treat it like any other email change (validate the new email via email token)