Step 1. Turn on the 2-step Verification

Open your Google Account and click the Security tab. Activate 2-step verification if it's not yet enabled.

After 2-step verification is enabled click the App Passwords:

Step 2. Generate the App Password

Select Other in the dropdown.

Then specify the app name. It can be anything

Now you can copy the app password

Step 3. Configure TrackMage

After you set up GMAIL go to TrackMage, open the team settings, and add new SMTP credentials like this: