A quick update on this issue, seems line any extension less than 3 characters, ie: .ca, .eu, .co etc... will not work. Anything with 3 characters ie: .com, .biz works just fine. When I type in the 2 character extension I get this invalid email icon on the right of the email field as soon as I move to the next input field.  2nd tier support from Constant Contact sent me an email that they are working on the problem and looking for a solution.  Crossing my fingers and hoping for a quick resolution. ... View more