A pillar of content and copywriting is to write as if you’re speaking to one single person at a time. This isn’t feasible with mass email marketing, but segmenting your list and messages helps attain the same sort of feeling. Email marketing segmentation transforms generic email into personalized and tailored messages more likely to resonate with your recipients.
Once your list is targeted, you need to spend an equally large portion of time coming up with a great deal – even if it means you might lose a bit of money on it. The underlying goal of any marketing campaign is to gain new customers, and it’s worth it to significantly reduce your profit margins to gain said customers. Once you have a surgically-honed list and an amazing offer, then you can spend some time on the design, copy, delivery methods, postage rates, date of delivery, size of the mailer…there are a lot of other options to consider, but following the 40/40/20 rule you can see how important audience and offer truly are.