Send simple message

def send(self, to, subject, body, reply_to=None, **kwargs):
        """
        Send simple message
        """
        if self.provider == "SES":
            self.mail.send(to=to,
                           subject=subject,
                           body=body,
                           reply_to=reply_to,
                           **kwargs)
        elif self.provider == "FLASK-MAIL":
            msg = flask_mail.Message(recipients=to, subject=subject, body=body, reply_to=reply_to,
                                     sender=self.app.config.get("MAIL_DEFAULT_SENDER"))
            self.mail.send(msg)