Allow capital letters in email address

I found a problem with discord regarding email address with capital letters : When you want to use an email that has capital letters, discord will register a flat version of it. For example if I try to register with the address : CapitalLetters@address.com Discord will register : capitalletters@address.com For some domains those two addresses aren't the same, so the user will never receive discord's emails, he won't even be able to confirm the account ! Could we have capital letters in email addresses?