Adds generators support for email backends that do not support it.

        """Write all messages to the stream in a thread-safe way."""

        if not email_messages:

            return

        msg_count = 0

        with self._lock:

            try:

                stream_created = self.open()

                    self.stream.write('-' * 79)

                    self.stream.write('\n')

                    self.stream.flush()  # flush after each message

                    msg_count += 1

                if stream_created:

                    self.close()

            except:

                if not self.fail_silently:

                    raise

        return len(email_messages)

        return msg_count

class EmailBackend(BaseEmailBackend):

    def send_messages(self, email_messages):

        return len(email_messages)

        return len(list(email_messages))

    def send_messages(self, messages):

        """Redirect messages to the dummy outbox"""

        msg_count = 0

        for message in messages:  # .message() triggers header validation

            message.message()

            msg_count += 1

        mail.outbox.extend(messages)

        return len(messages)

        return msg_count