Email marketing is powerful because it’s both high-impact and low-cost. Many of us have our hands in our email every single day, and what we see is so much different from what we see on our social media feeds. Subscribing to an email list means getting some sort of deal or freebie, unlike following a social media account, which only promises that you’ll see more of their posts. Newsletters can also be saved for later, filtered into inbox folders or…