docs: def _get_sender(self, sender):
          """
          Return a tuple of 3 elements
              0: the email signature "Me <email@me.com>"
              1: the name "Me"
              2: the email address "email@me.com"
  
          if sender is an email string, all 3 elements will be the email address
          """
          if isinstance(sender, tuple):
              return "%s <%s>" % sender, sender[0], sender[1]
          else:
              return sender, sender, sender