Fist off, thank you for this great plugin guys. I have been using eshop for a few years now, and I am suddenly getting failed transaction emails as well, even though payments are successfully being made to PayPal (I believe this error started to appear after the most recent update).
Here is an example of the failed email message:
subject: Paypal IPN -A Failed Payment Ref:6E81096254371003V
An instant payment notification was received
from email@example.com on 07/21/2012 at 11:21 PM
The transaction was not completed successfully. eShop could not validate the order.
item_number1: shirt-pants001 : Shirt and Pants L Blue
item_number2: shirt-pants001 : Shirt and Pants L Black
address_street: 73 XXX avenue
payment_date: 16:21:37 Jul 21, 2012 PDT
address_zip: X8X 3X2
address_name: Michael XXX Goalie Training
payer_business_name: Michael XXX Goalie Training
item_name1: Stanfields Pro Hockey Underwear
item_name2: Stanfields Pro Hockey Underwear
Regards, Your friendly automated response.