flask-mail发送邮件始终失败

 from flask_mail import Mail,Message
 from flask import Flask
 import os

 app=Flask(__name__)
 app.config.update(
     DEBUG = True,
     MAIL_SERVER='smtp.qq.com',
     MAIL_PROT=25,
     MAIL_USE_TLS = True,
     MAIL_USE_SSL = False,
     MAIL_USERNAME = '4@qq.com',
     MAIL_PASSWORD = 'xxxxxxxx',
     #MAIL_PASSWORD = 'xxxxxxxx',
     MAIL_DEBUG = True
 )
 mail=Mail(app)

 @app.route('/')
 def index():
 # sender 发送方哈，recipients 邮件接收方列表
     msg = Message("Hi!This is a test ",sender='4@qq.com', recipients=['3@qq.com'])
 # msg.body 邮件正文
     msg.body = "This is a first email"
 # msg.attach 邮件附件添加
 # msg.attach("文件名", "类型", 读取文件）
 #     with app.open_resource("F:\2281393651481.jpg") as fp:
 #         msg.attach("image.jpg", "image/jpg", fp.read())

     mail.send(msg)
     print ("OK")
     return "Sent"

 if __name__=='__main__':
     app.run(debug=True)

发送一直失败，查网上比较靠谱的方法参考两篇文章

http://blog.csdn.net/huochen1994/article/details/51282093

http://tieba.baidu.com/p/3870714637   这个帖子的最后一答