from flask_mail import Mail,Message
...
application.config['MAIL_SERVER']='mail.mydomen.ru'
application.config['MAIL_PORT']=995
application.config['MAIL_USE_TLS']=False
application.config['MAIL_USE_SSL']=True
application.config['MAIL_USERNAME'] = 'info@mydomen.ru'
application.config['MAIL_PASSWORD'] = 'pasmail'
...
application.config['ADMINS'] = ['info@mydomen.ru']
mail = Mail(application)
...
emsg='text mail send'
#отправка почты
email=Message('Заказ такси',sender='info@mydomen.ru',recipients=['myemail@mail.ru'],body=emsg)
...
mail.send(email)