Hi Ray,
I've searched in the customer's PayPal account profile for IPN settings, but can't find any. They're using a personal paypal account. However, they had a previous version of the website that used eCart and the same PayPal account and never recevied these warning messages on that version. We didn't develop the old version of the website (the eCart version). We are using the buy it now button from the free tools extensions on the new website. Any other ideas, our customer is still receiving these emails from PayPal