blendle.com/signup/account rejects email GMail addresses of the form username+label@gmail.com - even though the launch.blendle.com/hackernews.html page accepts

blendle.com/signup/account rejects email GMail addresses of the form username+label@gmail.com - even though the launch.blendle.com/hackernews.html page accepts them. It's one of my pet peeves, please fix it!