[1.2.X] Fixed #14301 -- Further refine changes made in r14217 to support...

            self._lock.release()

        return num_sent

    def _sanitize(self, email):

        name, domain = email.split('@', 1)

        email = '@'.join([name, domain.encode('idna')])

        return email

    def _send(self, email_message):

        """A helper method that does the actual sending."""

        if not email_message.recipients():

            return False

        from_email = self._sanitize(email_message.from_email)

        recipients = map(self._sanitize, email_message.recipients())

        try:

            self.connection.sendmail(email_message.from_email,

                    email_message.recipients(),

            self.connection.sendmail(from_email, recipients,

                    email_message.message().as_string())

        except:

            if not self.fail_silently:

        self.assertEqual(message.from_email, from_email)

        self.assertEqual(message.to, [to_email])

        self.assertTrue(message.message().as_string().startswith('Content-Type: text/plain; charset="utf-8"\nMIME-Version: 1.0\nContent-Transfer-Encoding: quoted-printable\nSubject: Subject\nFrom: =?utf-8?b?ZnLDtm1Aw7bDpMO8LmNvbQ==?=\nTo: =?utf-8?b?dMO2QMO2w6TDvC5jb20=?='))

    def test_idn_smtp_send(self):

        import smtplib

        smtplib.SMTP = MockSMTP

        from_email = u'fröm@öäü.com'

        to_email = u'tö@öäü.com'

        connection = mail.get_connection('django.core.mail.backends.smtp.EmailBackend')

        self.assertTrue(send_mail('Subject', 'Content', from_email, [to_email], connection=connection))

class MockSMTP(object):

    def __init__(self, host='', port=0, local_hostname=None,

                 timeout=1):

        pass

    def sendmail(self, from_addr, to_addrs, msg, mail_options=[],

                 rcpt_options=[]):

        for addr in to_addrs:

            str(addr.split('@', 1)[-1])

        return {}

    def quit(self):

        return 0