I do that for gmail, but I've discovered that many sites will claim that xxx+yyy@gmail.com is not a valid email. Also it would be very easy for a scummy site t

I do that for gmail, but I've discovered that many sites will claim that xxx+yyy@gmail.com is not a valid email. Also it would be very easy for a scummy site to just remove the +yyy part and the rest will still be a valid gmail address.