code: def send(self, text, fmt):
          
          main_fmt, sub_fmt = fmt.split('/')
          if sub_fmt.lower() == "text":
              msg = MIMEText(text, "plain")
          elif sub_fmt.lower() == "html":
              msg = MIMEText(text, "html")
          else:
              raise ValueError("Unknown message format: {}".format(fmt))
          msg['Subject'] = self._subject
          msg['From'] = self._sender
          msg['To'] = ', '.join(self._recipients)
          if self._port is None:
              conn_kwargs = dict(host=self._server)
          else:
              conn_kwargs = dict(host=self._server, port=self._port)
          self._log.info("connect to email server {}".format(conn_kwargs))
          try:
              s = smtplib.SMTP(**conn_kwargs)
              #s.set_debuglevel(2)
              refused = s.sendmail(self._sender, self._recipients, msg.as_string())
              if refused:
                  self._log.warn("Email to {:d} recipients was refused".format(len(refused)))
                  for person, (code, msg) in refused.items():
                      self._log("Email to {p} was refused ({c}): {m}".format(p=person, c=code, m=msg))
              s.quit()
              n_recip = len(self._recipients)
          except Exception as err:
              self._log.error("connection to SMTP server failed: {}".format(err))
              n_recip = 0
          return n_recip
docs: Send the email message.
  
          :param text: The text to send
          :type text: str
          :param fmt: The name of the format of the text
          :type fmt: str
          :return: Number of recipients it was sent to
          :rtype: int