docs: def GMailer(recipients, username, password, subject='Log message from lggr.py'):
      """ Sends messages as emails to the given list
          of recipients, from a GMail account. """
      import smtplib
      srvr = smtplib.SMTP('smtp.gmail.com', 587)
      srvr.ehlo()
      srvr.starttls()
      srvr.ehlo()
      srvr.login(username, password)
  
      if not (isinstance(recipients, list) or isinstance(recipients, tuple)):
          recipients = [recipients]
  
      gmail_sender = '{0}@gmail.com'.format(username)
  
      msg = 'To: {0}\nFrom: '+gmail_sender+'\nSubject: '+subject+'\n'
      msg = msg + '\n{1}\n\n'
  
      try:
          while True:
              logstr = (yield)
              for rcp in recipients:
                  message = msg.format(rcp, logstr)
                  srvr.sendmail(gmail_sender, rcp, message)
      except GeneratorExit:
          srvr.quit()