I had a customer buy a ring so I could test my Supa site & it came from orders@supadupa.me you also get a 2nd email from Supa to confirm the payment & then you get the Paypal email = 3 email for 1 order. I think Supa should only send one order confirmation email, skip the payment email. I'd also suggest a small thumbnail image of the product in the order email like etsy does, it helps me if I have an image on my receipt.
The order page in Supa is very nice, similar to Etsy, very organized!