After calling PayPal support (you got to give the automated system a reason for the call, and eventually it will transfer you to an agent) i got a hold of an agent that pointed me to paypal.com/mts the explaination there is below, but I opend a ticket, because this still does not address my question, of why now, since my cart has been in place since 2007 As of 2/3/2009 some merchants may be receiving emails with the subject of "PayPal Instant Payment Notification Warning". The purpose of this email is to notify you that PayPal is having trouble delivering IPNs to the URL(s) in the email. If you are receiving these emails you should check your IPN settings to ensure that the URL is set correctly and also that the IPN script on your server is in the location specified in the IPN settings on your PayPal account or as specified in your payment processing software that is integrated with PayPal. You can see which IPNs are failing by checking your PayPal account IPN history. To see this please follow these steps: - Login to PayPal account and hover the mouse over "History" - In the drop down menu click "IPN history" (See screenshot below) - Within the IPN history page, look for IPNs that are in a retrying or failed state to find which IPN script is failing - Clicking on the "Message ID" for these IPNs will show the message that was sent, the number of retries and the URL it was sent to
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