This action will prepare an email draft containing the recipient, subject and body, based on your Drafts post; and store it as a reminder in Due. The first line of your post will be treated as the email recipient, the second line as the email subject, and the third line as the date/time when you want to be reminded. The fourth line up to the end…

MailLaterWithBody

due://x-callback-url/add?
  title=Mail%20about%20[[line|2]]%20at%20[[line|3]]%0A
    {{launchpro-email://x-callback-url/?
      to=[[line|1]]&
      subject=[[line|2]]&
      body=[[line|4..]]&
      x-success=due%3A%2F%2F}}&
  x-source=Drafts&
  x-success={{drafts://}}