Paypal Payment Standard IPN address

Hi Can anyone tell me the correct IPN details for Paypal Standard. I received an email from Paypal this morning... although I am actually received notifications of payments received. Should I just ignore it? we have had so many problems just getting this working I don't want to mess things up!

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

http://www.coucouchic.fr/en-gb/extensio ... d/callback

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.

It should be raw URL, not SEF.