PayPal confirmations

I've got a real mystery on my hands. Both of the clubs (Quest 4643 and Valencia 1670) in which I set PayPal up in are not receiving payment notifications even though they are going to treasurer@. Paypal has verified that the emails are going out. Both treasurers can receive emails to treasurer@. They've checked their spam folders and there are no PayPal emails there. Occam's Razor suggests the simplest solution would be the freetoasthost server handling of emails from PayPal, but there's always the sock stealing gremlin...

Could there be a reason PayPal emails wouldn't be forwarded?

Paypal is commonly blacklisted by clubs and your clubs are using the crowd-sourced blacklists, but you have not entered any exceptions for Paypal. I suggest putting @paypal.com in the exceptions box.