Step 1: Follow the steps to integrate an email account.
Step 2: Also add SmartReach.io to the trusted app list in your G-Suite admin console by following the steps here.
Step 3: Select Gmail from the list.
Step 4: Select a gmail account you wish to connect to (in case of multiple email accounts) or login to gmail.
Step 5: Click on Allow to grant SmartReach.io access to Read, Compose, Send, Receive and permanently delete all email from your gmail.
Voila!! You can use gmail account from SmartReach.io for your campaigns.