Hosted Email - Not Receiving Messages From Gmail?

Hosted Email - Not Receiving Messages From Gmail?

I've set up my hosted email and for some reason, anytime I send myself an email from my Gmail account, I never receive the email nor do I get a bounce back.

But I'm able to receive email from anywhere else that I've tried thus far including Yahoo Mail and other personal email addresses.

What am I missing and why is Gmail getting singled out?

Thanks