How to use the yagmail.sender.SMTPBase function in yagmail

self.smtp.starttls()
        self.smtp.docmd("AUTH", "XOAUTH2 " + auth_string)

    def feedback(self, message="Awesome features! You made my day! How can I contribute?"):
        """ Most important function. Please send me feedback :-) """
        self.send("kootenpv@gmail.com", "Yagmail feedback", message)

    def __del__(self):
        try:
            if not self.is_closed:
                self.close()
        except AttributeError:
            pass


class SMTP(SMTPBase):
    def login(self):
        if self.oauth2_file is not None:
            self._login_oauth2(self.credentials)
        else:
            self._login(self.credentials)


class SMTP_SSL(SMTP):
    def __init__(self, *args, **kwargs):
        import warnings

        warnings.warn(
            "It is now possible to simply use 'SMTP' with smtp_ssl=True",
            category=DeprecationWarning,
        )
        kwargs["smtp_ssl"] = True