paypal payment notification refused ip not valid

hello,

each time someone pays for an order on our website via paypal we get the following email:

Hello,
A Paypal notification was refused because the IP 173.0.81.1 is not in the list of valid IPs :
66.211.169.*
64.4.241.*
66.211.170.*
216.113.191.*
173.0.81.1*

Check the documentation concerning this issue at www.hikashop.com/index.php?option=com_up...ment-paypal-error#ip
This notification was for the order C1Y5T58 on the website www.spaldingfasteners.co.uk/
You can access the order details directly by clicking on the link below after logging in your back end:
www.spaldingfasteners.co.uk/administrato...k=edit&order_id=1558

so I followed the instructions and edited the paypal payment method in the payment options. I have attached a copy of what it looks like on my end. but we still keep getting emails every time someone pays via paypal - any ideas?

Hi, I have the same error in email:

Ciao,
Una Paypal notifica è stata rifiutata poiché l'IP 173.0.81.1 non è nella lista degli IP validi :
66.211.169.*
173.0.88.*
66.211.170.*
173.0.82.*

refresh IP LIST don't work

I try to leave empty

thanks