Hi rnexussix,
I just installed did a fresh installation of this plugin and I am using Google Business App.
Please make sure you have the following settings:
-> Send all WordPress emails via SMTP. = true
-> smtp host: smtp.gmail.com
-> port: 587
-> Use TLS encryption. This is not the same as STARTTLS. For most servers SSL is the recommended option
-> Yes: Use SMTP authentication.