One one of my client's site, we are getting emails from PayPal which state the following:

"Dear XYZ,

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

http://www.domainname.co..._InstantNotification.asp


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.

Sincerely,
PayPal"

This did not happen earlier and started happening in the last 2 weeks. Any ideas why we would get these emails from Paypal?

Actually from what I see of the URL it appears this actually may be a remnant from when this website was on an older SF application before being converted to BV.