Beyond sending basic newsletters, the best email marketing services offer custom auto-responders, which help you stay in touch with your contacts with automatically generated emails based on special occasions (such as their birthday or anniversary), welcome emails for new subscribers, or thank you emails for recent purchases.
The most advanced Digital Marketing Services offer custom workflows where you can specify triggers based on actions (such as opening an email or making a purchase) or on inaction (such as ignoring emails). With these services, you can also set up a series of emails (such as tutorials) to be sent to segments of users, and you can pause or stop a campaign at any time. You can also move contacts into new segments once they have completed tutorials.
Of course, sending out campaigns is no help to your business unless you can track your successes and failures and make adjustments based on your learnings. All of the services covered here offer some level of tracking, whether it's simple open and click rate data, color-coded charts and statistics, or even integration with Google Analytics.
As a growing business, you may also be looking for a CRM solution, and you'll find that the more advanced email marketing services have begun to crossover into CRM. It makes sense: Both types of software deal with managing and communicating with customers. A handful of these services are one-stop shops, either offering both Email Marketing and CRM out of the box or as add-on services.