code: def append_strings(self, string_list, header=False):
          
  
          for s in string_list:
              self.append_string(s, header=header)
          return
docs: Append tag=pairs for each supplied string.
  
          :param string_list: List of "tag=value" strings.
          :param header: Append to header if True; default to body.
  
          Each string is split, and the resulting tag and value strings
          are appended to the message.