Our current registration/login flow isn't populating email address.
Fixes bug 689329, though we should ensure this page is rate-limited in the future so we don't have folks hammering the registration page harvesting known Mozillian email addresses (or just valid emails to spam in general).
…p doesn't save email auth_user table. Filtering by username, which it does populate. Fixes Bug#689324
… 1.0. Nuances to be added later.