Haven't found an existing discussion about this so thought I'd ask. We send an email one day after someone creates an account on our academy site, encouraging them to start a course. If they haven't done so 3 days later, we would like to send a "follow up" email like a reply to the previous email reminding them to take that action. Instead of sending a brand new email, is there a way to make it seem like a reply to the thread of the already sent email from Day 1? These emails are all coming from the program manager so our thinking is that it will look a lot more personalized if it looks like it's a reply to the first email instead of a brand new email thread.