flask_mail.py 文件源码

def send(self, message):
        """Verifies and sends message.

        :param message: Message instance.
        """
        assert message.recipients, "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(message.sender,
                               message.send_to,
                               message.as_string())

        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()