Hi, i have configured the paypal plugin following to the doc (http://www.amember.com/docs/Payment/Paypal). But it dont works. When i send a paypal payment, i get the following Message 2 times: 04.05.12 14:37 Click to Expand 173.0.81.1 IPN seems to be received from unknown source, not from the paysystem Click to Expand /amember/payment/paypal/ipn aMember Pro 4.1.15