def send_mail(sender,
          to,
          subject,
          body,
          make_sync_call=apiproxy_stub_map.MakeSyncCall,
          **kw):
  """Sends mail on behalf of application.

  Args:
    sender: Sender email address as appears in the 'from' email line.
    to: List of 'to' addresses or a single address.
    subject: Message subject string.
    body: Body of type text/plain.
    make_sync_call: Function used to make sync call to API proxy.
    kw: Keyword arguments compatible with EmailMessage keyword based
      constructor.

  Raises:
    InvalidEmailError when invalid email address provided.
  """
  kw['sender'] = sender
  kw['to'] = to
  kw['subject'] = subject
  kw['body'] = body
  message = EmailMessage(**kw)
  message.send(make_sync_call)


SendMail = send_mail

SendMail = send_mail