flask_mail.py 文件源码

def send(self, message, envelope_from=None):
        """Verifies and sends message.

        :param message: Message instance.
        :param envelope_from: Email address to be used in MAIL FROM command.
        """
        assert message.send_to, "No recipients have been added"

        assert message.sender, (
                "The message does not specify a sender and a default sender "
                "has not been configured")

        if message.has_bad_headers():
            raise BadHeaderError

        if message.date is None:
            message.date = time.time()

        if self.host:
            self.host.sendmail(sanitize_address(envelope_from or message.sender),
                               list(sanitize_addresses(message.send_to)),
                               message.as_bytes() if PY3 else message.as_string(),
                               message.mail_options,
                               message.rcpt_options)

        email_dispatched.send(message, app=current_app._get_current_object())

        self.num_emails += 1

        if self.num_emails == self.mail.max_emails:
            self.num_emails = 0
            if self.host:
                self.host.quit()
                self.host = self.configure_host()