Log in to your Gmail account.
Click on the cog wheel and select Settings.
From the tabbed links across the top, select Accounts and Import.
Find the section Change account settings: and click on Other Google Account settings.
A new page will open. In the box Sign-in & security click on Connected apps & sites.
Now, again find the section Connected apps & sites near the bottom of the page and set Allow less secure apps to ON.
Your account will now be set up to server as your email server for your apps.
Return to Email Invites.