Moz builds tools that make inbound marketing easy. In this Free trial- winback email sequence they introduce new features from Moz Pro, like: Keyword Explorer.
They open with an email about the new features of Moz Pro. Hereby they introduce a 30-day trial, to learn more about the new features of Moz Pro. They use urgency to persuade potential customers to subscribe for the free trial, by giving constant reminders of the limited chance to join.
Read more about Moz here: moz.com