Check your server that handles PayPal Instant Payment Notifications

From a client:

“We’re getting emails from PayPal that say Please check your server that handles PayPal Instant Payment Notifications (IPN). IPNs sent to the following URL(s) are failing. Matt, what does this mean?”

I’ve gotten the same warnings. I traced it to work I did long ago on my site that was just exploratory development work — i.e.: it doesn’t do anything on my server, not critical to my sites.

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