Smart Coupons for WooCommerce

Given more and more people are abusing single use or first-order coupons by creating new email accounts, the “excluded emails” field is pretty much used on every coupon in many stores. It would be great to have one site-wide “Excluded Emails” list where admins can add email addresses that should not be able to use *any* coupon on the site because they’re emails belonging to already existing users who are trying to abuse the system.