My Macbook pro won't take a ".us" email address
I have a early 2013 Macbook pro and have been trying to set up a ".us" email address. I can set up a ".com" without any issues but when I try the ".us" email it says it cannot authenticate the email or password. Suggestions? ideas? Anyone had sucess with an email other than a ".com"? I don't have a ".net" to try but perhaps there is an issue there as well...
MacBook Pro with Retina display, OS X El Capitan (10.11.4)