Try and guess what the number one, (absolutely) irreplaceable marketing asset for each ecommerce business is? Don’t know it? Sure you do, it’s good (g)old E-mail! Yes, email is the number 1 revenue driving channel. No matter how much traction social media or other channels are getting email is still the channel with highest ROI – 3800% to be precise. For each dollar spent on email marketing, businesses generate $38 in revenue.