PayPal Instant Payment Notifications Email and purchases not showing in CF?

Received the following email from PayPal. Is there an updated setting I need to apply in Funnelish? As a result some of the PayPal purchases are not going through.

Please check your server that handles PayPal Instant Payment Notifications (IPN). IPNs sent to the following URL(s) are failing:

If you do not recognize this URL, you may be using a service provider that is using IPN on your behalf. Please contact your service provider with the above information. If this problem continues, IPNs may be disabled for your account.

Thank you for your prompt attention to this issue.

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That email can be ignored @justdeandre, It does not affect your PayPal purchases…

How do you know if some of your PayPal purchases are not going through? can you provide us with more details?

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For PayPal sales not showing up in CF have you checked this: Webhooks not working since about 10 hours ago