The most advanced email 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.
How do you create a good email campaign?
For automatic renewals, try using an autoresponder that sends users an alert that their account is about to be charged. You can load these notification emails with contact information for your customer care team, or links to pages where users can update their billing or shipping information. If your subscriptions don't autorenew, craft your drip campaign with a clear call to action, prompting users to re-up with your service. And for the users that do renew, be sure to send them a drip thanking them for staying with your service and perhaps prompt them to share your product with their friends.
Whether you're onboarding a new customer or keeping a user engaged, the sequence of your sends plays a crucial role in the success of each campaign. Consider how much information your target user needs, when he or she might need it, and why. Over on his blog, Jason Delodovici wrote a great post about a drip campaign that he spearheaded, noting the order he chose for each email—from signup to sale—and why.