I need some help getting the default settings to work in enewsletter setup

I have entered the gmail information as it is supposed to be. I know the username and password are entered correctly because I can log into the account.

No matter what I enter I get the failed to connect message. I have verifies that POP and imap are enabled in the gmail account settings.

Is there something I am missing? Have you got any advice to help me get this working. The client is looking to have an email sent out tomorrow.

Thank you!