MX records changed and verified. Sending but not receiving emails

The domain is tiger milk.eu and the MX records have been changed to point to your servers as per instructions. After 1 hour I am still not receiving any of my test emails. The emails that i send out are received in my other email accounts but when I reply to them the emails do not arrive in my zoo mailbox.

Please let me know what the problem is as I wish to upgrade asap to add another domain as my own server is currently down and my clients need to have emails asap

thanks