that's.. really on you I think, and not at all similar to one site having differing validation rules in different places for the same data. What gmail does ther

that's.. really on you I think, and not at all similar to one site having differing validation rules in different places for the same data. What gmail does there isn't some kind of standard, it's a unique special feature google does. You don't want other sites getting clever about this sort of thing, because if the rules change much worse things will happen. Now, sites that treat email addresses as case sensitive - those are evil.