Connecting G Suite custom email to Shopify

First you need to verify your domain and create your custom email in G Suite. After verifying your email is properly working (send a test email) go to the Shopify admin and follow these steps -

1. Go to Online Store>Domains
2. Click the name of the domain in the Shopify-managed domains section
3. Click Use third-party hosting service
4. Select G Suite as your provider and enter the TXT code or meta tag that was provided to you when you verified your domain
5. Click Save