My host has started blocking all ports (for added security), but it has meant I can no longer use PayPal's IPN when users pay for a mail account. GMail reports errors and I have to manually approve payments. (The payment is processed by PayPal, but no notification is received by GMail so the user is listed as pending and cannot login).

I wondered what my options were. My host suggests if there is a list of IP addresses for PayPal he can add these to his whitelist, so the IPN function will work again. I don't even know yet whether this is possible, even if there are IP's to use.

Any suggestions would be appreciated for getting the IPN to work again.

Jason