Использование Flask для отправки регистрационного email'а

 FLASKY_ADMIN = os.environ.get('FLASKY_ADMIN')
 
    # email setting
    FLASKY_MAIL_SUBJECT_PREFIX = '[Flasky]'
    MAIL_SERVER = 'smtp.yandex.com'
    MAIL_USE_SSL = True
    FLASKY_MAIL_SENDER = 'Flasky Admin email server '
    MAIL_PORT = 465
    MAIL_USE_TLS = True
    MAIL_USERNAME = '*******tests.testovich*******'     #использую часть до @, так по крайней мере написано в документации яндекса
    MAIL_PASSWORD = '*******topsecreatPasssword*******'

from threading import Thread
from flask import current_app, render_template
from flask.ext.mail import Message
from . import mail
 
 
def send_async_email(app, msg):
    with app.app_context():
        mail.send(msg)
 
 
def send_email(to, subject, template, **kwargs):
    app = current_app._get_current_object()
    msg = Message(app.config['FLASKY_MAIL_SUBJECT_PREFIX'] + ' ' + subject, sender=app.config['FLASKY_MAIL_SENDER'],
                  recipients=[to])
    msg.body = render_template(template + '.txt', **kwargs)
    msg.html = render_template(template + '.html', **kwargs)
    thr = Thread(target=send_async_email, args=[app, msg])
    return thr

@auth.route('/confirm')
@login_required
def resend_confirmation():
    token = current_user.generate_confirmation_token()
    print(token)
    send_email(current_user.email,
               'Confirm Your Account', 'auth/email/confirm', user=current_user, token=token)
    flash('A new confirmation email has been sent to you by email.')
    return redirect(url_for('main.index'))