Coupon – for only one specific user

When you create a coupon restrict it to the email address: https://inspire.click/ms_a0f6r.png

To be clear, I enter the registered email address of the user in question ?
I know this sounds dumb, but I want to be sure before making an error.

After having done some tests on my dev server (WC version 2.6.0), I can confirm that this does NOT work.