Look, the bottom line is that email marketing has a 4,200% return on investment (ROI). That’s a return of $42 for every dollar spent. — Look, the bottom line is that email marketing has a 4,200% return on investment (ROI). That’s a return of $42 for every dollar spent. In August 2021, HubSpot published their email marketing stats report and the findings speak for themselves, you can see some of the highlights below: