If you use 2-Step-Verification and are seeing a “connection error” error when trying to test the Gmail connection in Hotter email account settings, an App password may solve the problem. You’ll only have to enter an App password once, so don’t worry about memorizing it.
Follow these steps ONLY if you have 2-Step-Verification ENABLED
App passwords. If prompted, enter your password.
Select appdrop-down menu. If you selected
Other (custom name), type the application name (like "Hotter").