[adamdoran]

It would be really good to see RFC 5233 local-part filtering characters (e.g. '+') being permitted in the validation for email addresses on this list. It's much less of a problem these days, but the number of times a sign up form has flat out refused to accept these as valid - or worse the sign up process accepted it, but the login simply doesn't work!

[Terretta]

Many of these sites, such as your bank, or telco, if you talk to a human using a terminal screen, the human can type in the + symbol for you.