I am having a similar probelm as @johnzena above.
As a seller I recieve notification that an order was recieved which includes a copy of what the seller email should look like, but as a buyer I only recieve the paypal confirmation email. The link back to the site from paypal to my customized thank you page works just fine (the download link appears and it works), but no email from the site to the buyer with a link or confirmation of the sale. I have tried both the wordpress mail funtion and the plugin mail script and both work the same.
Any ideas?
Thanks!
casey