I've once tried to sign up for some site (I can't remember which) which went through with the usual successful signup, please check your email text. The email I

I've once tried to sign up for some site (I can't remember which) which went through with the usual successful signup, please check your email text. The email I received however was something along the lines of 'you already have an account with this email!', which seems like the best way of doing things.