There’s no hard and fast number attached to how much you should invest in email marketing. We recommend most of our clients begin by investing a minimum of $1,500 – per month in our services – which is enough for us to run effective campaigns and gather data about the best way to proceed. Of course, where you invest your email marketing spend is just as important as how much. For eCommerce companies, for example, Welcome Automations, Cart Abandonment Automations, and holiday sales campaigns tend to yield the best ROI.