How to use the yagmail.message.prepare_message function in yagmail

to=None,
        subject=None,
        contents=None,
        attachments=None,
        cc=None,
        bcc=None,
        headers=None,
        newline_to_break=True,
    ):
        addresses = resolve_addresses(self.user, self.useralias, to, cc, bcc)

        if self.soft_email_validation:
            for email_addr in addresses["recipients"]:
                validate_email_with_regex(email_addr)

        msg = prepare_message(
            self.user,
            self.useralias,
            addresses,
            subject,
            contents,
            attachments,
            headers,
            self.encoding,
            newline_to_break,
        )

        recipients = addresses["recipients"]
        msg_string = msg.as_string()
        return recipients, msg_string