User signs up multiple times

I have a simple email sign up form.  How do I create a page that says the user has already signed up so if they sign up again by accident, they don't recieve duplicate emails. I've read somewhere where they are not suppose to get the same email again, but that does not seem to be the case. I've signed up multiple times with the same form, and I still get the email.  However, in the DRM, it's still only 1 user which is good.  Any ideas?

Hi Gregory,
There's no way to perform that kind of server side check and return an error message.
Cheers,
-mario

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