It's About The Message
Your customer's and prospects still use email. A lot. But what's changed is that they want to receive messages that are informational rather than purely promotional
Easy To Test And Measure
By using A/B Testing and analytics decide what is working and how much you are getting out of your investment.
Email is still one of the lowest cost marketing options you can use. Even if you need to adjust your strategy it can still get you a significant return on your investment.