Refer this blog link, it will be more useful for you to setup email functionality.
HI Harsh Bhanushali,
1. Click ctrl+g in your Studio pro and search for the Encryption key.
You will find a constant in the Encryption module, open the constant and add your secret key and save it.
2. In your Navigation, Configure the EmailConnector_Overview page.
Before this setup configure the Project and module Security accordingly.