Unfortunately there are no features or options to change the email message. The work around is to use PayPal's IPN feature, whereas once notified of the transaction, you would be able to send a custom email message to the buyer. This is more secure than other methods. You can learn more about this feature here: https://www.x.com/developers/paypal/products/instant-payment-notification Your other option would be to use a 3rd party service. For example, check out this one: http://www.e-junkie.com/
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