NEVER, ever, post your personal details in public!!! That's what email support is for...
In any case, the email used on Esellerate to register the purchase, doesn't have anything to do with the email used for the payment.
If you are paying with PayPal, simply do not use the "PayPal Express Checkout" button, because what that button does, is to use the PayPal login/password data in order to SAVE you from entering all your details on Esellerate (including the email), but of course the would defeat the purpose of the Coupon, since you must insert the old email in order to activate it.
So, if you use PayPal, use the regular checkout button, instead of the PayPal "Express" checkout, so you'll be able to insert all your data in Esellerate (including the *original* email used for the JFK V1 order AND the Coupon code ), and THEN select PayPal as payment.