flask_mail 在本地测试能成功发邮件，但是弄上服务器就一直提示“error: [Errno 110] Connection timed out”错误，服务器环境是 nginx+flask+sqlalchemy.代码放在内容区里！

各位大大，是不是我的服务器需要配置什么端口之类的？搞了两天了，无法搞好！

服务器上的 INPUT 端口我只开放了 80,22,21，其他都没有开放。
OUTPUT 和 FORWARD 上我都是 ACCEPT

代码如下：

from flask import Flask
# from run_celery import make_celery
# from celery import platforms
from flask_mail import Mail,Message

app = Flask(__name__)
app.config.update(
    # CELERY_BROKER_URL='redis://localhost:6379/0',
    # CELERY_RESULT_BACKEND='redis://localhost:6379/1',
    DEBUG = True,
    MAIL_SERVER='smtp.qq.com',
    MAIL_PROT='25',
    # MAIL_USE_SSL = True,
    MAIL_USE_TLS = True,
    MAIL_USERNAME = '111111@qq.com',
    MAIL_PASSWORD = 'rkuynjxxxxxpqicfc',
    MAIL_DEBUG = True
)
# celery = make_celery(app)
mail = Mail(app)

@app.route('/')
def index():
	msg = Message("This is only test Mail",sender='111111@qq.com',recipients=['22222@qq.com'])
	msg.body = "This is my first Mail."
	mail.send(msg)
	print('Mail send OK')
	return 'sent'

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

以下是 nginx 的配置：

server {
  listen 80;
  server_name www.demo.com;
  access_log /wwwlogs/www.demo.com_nginx.log combined;
  index index.html index.htm index.php;
  root /wwwroot/www.demo.com;

  location ~ .*\.(wma|wmv|asf|mp3|mmf|zip|rar|swf|flv|mp4)$ {
   valid_referers none blocked *.demo.com www.demo.com;
   if ($invalid_referer) {
      return 403;
    }
  }
  location / {
    try_files $uri @flask;
  }
  location @flask {
    proxy_set_header  X-real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_pass http://127.0.0.1:5000;
  }
  location ~ .*\.(bmp|swf|flv|mp4)$ {
    expires 30d;
    access_log off;
  }
  location ~ /\.ht {
    deny all;
  }
}