I'm getting almost daily emails from Paypal on both my OC 2.3.0.2 stores about :
Please check your server that handles PayPal Instant Payment Notifications (IPN). IPNs sent to the following URL(s) are failing
The URL I have is
https://www.mysite.com/index.php?route= ... t/callback
I understand the above URL doesn't actually lead anywhere and that the OC Paypal Standard module actually takes care of the callback. However, I still get the message that the URL are failing.
In IPN history, I see a lot of "retry and then sent" for a few messages
So it seems to be working but it has to try the message once or twice.

Any ideas?
If I turn of IPN messages, I think my orders go to "missing" status.