Email marketing has long been one of the more profitable online marketing channels. But it is often overlooked. Don’t get me wrong, there are plenty of really solid online marketing channels out there like SEO, PPC, CRO, retargeting, etc. But email has consistently remained a top ROI producer. The only problem is that you have to do it “right.” If you can master the intricacies of email marketing then you can really increase your bottom line. I like this infographic on the value of leveraging an email newsletter.