Not receiving emails

I have not received any emails since last Wednesday, and I know I should have received notifications from Amazon for orders placed, shipped, and received. I sent myself a test email from Gmail, and another from my Comcast account to my Comcast account. Neither was received. A test message from the Comcast account to the Gmail account was successfully received. All of my previous emails are still visible, just not receiving any new ones. I am using Chrome to access my account on both my laptop and phone, each with the same result.