1,2,3,14 add a lot of complexity which increases the potential for bugs and security issues. 12 is almost certainly a typo 13 is probably a spammer Also <inp

1,2,3,14 add a lot of complexity which increases the potential for bugs and security issues. 12 is almost certainly a typo 13 is probably a spammer Also <input type=email> will reject several of these as well, so if you have such an edge-case email in your database, you'll run into issues with html forms.