Today our inboxes are flooded with email marketing campaigns, some feeling spammy, but there is no denying the impact a well-crafted message can have on your customers. Email marketing has one of the best return on investment, for every dollar spent over $40 is returned, on average. In our previous Email Marketing 101 post, we talked about what email marketing is and some quick tips to get started. In this post, we’ve put together a few tips to help you expand your knowledge in email marketing and continue to increase your return.