Fair call, I'm all for fewer arbitrary rules. Especially if it's less code. I still consider the "oh, but it's valid to have dotless on RHS!" to be one of thos

Fair call, I'm all for fewer arbitrary rules. Especially if it's less code. I still consider the "oh, but it's valid to have dotless on RHS!" to be one of those facts which is true, but irrelevant. Those three hypothetical users can't receive email sent from most major web providers (e.g. gmail, who don't allow dotless To:), can't sign up to most web sites (who get their validation wrong), and are at the mercy of pitiless local dns resolver rules (pope@va will go to pope@va.com for US users, a lot of the time).