How do email reminders work?

You may utilize email reminders in two ways. One way is to add reminders while composing a new email. In that case, the reminder is attached to the email you compose & sent. The other way is the add reminders to individual emails or conversations while you are viewing them. In both cases, email reminder can be set via the “Remind Me” button. When you press that button you can see your options and you may select a date & time for your reminder.