I have been recieving this email from paypal
Hello XXXXXXXXXX,
Please check your server that handles PayPal Instant Payment Notifications (IPN). IPNs sent to the following URL(s) are failing:
https://XXXXXXXXXX/paypal/ipn/
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.
Thanks, PayPal
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I do not know why I am receiving this as all my Paypal Payments seem to be going through fine. I only use this paypal account for my magento store too (no ebay or other selling channels). And on magento I am only utilizing express checkout right now. How would I find the source of the problem and fix it?
Thanks