python - 《Flask Web开发》第六章电子邮件【Errno 11002】-PHP中文网问答

看到书第六章在Python shell中发送电子邮件。代码都是按照数上的照打的，除了个别格式改动。
hello.py

from flask_bootstrap import Bootstrap
from flask_script import Manager     #把命令行解析功能添加到hello.py中
from flask import Flask
from flask import render_template
from flask_moment import Moment
from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField
from wtforms.validators import Required
from datetime import datetime
from flask import session
from flask import redirect
from flask import url_for
from flask import flash
from flask_sqlalchemy import SQLAlchemy
import os
from flask_script import Shell
from flask_migrate import Migrate, MigrateCommand
from flask_mail import Mail

basedir = os.path.abspath(os.path.dirname(__file__))

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI']=\
    'sqlite:///' + os.path.join(basedir, 'data.sqlite')
app.config['SQLALCHEMY_COMMIT_ON_TEARDOWN']=True
app.config['SECRET_KEY'] = 'hard to guess string'
app.config['MAIL_SERVER'] = 'smtp.googlemail.com'
app.config['MAIL_PORT'] = 587
app.config['MAIL_USE_TLS'] = True
app.config['MAIL_USERNAME'] = os.environ.get('MAIL_USERNAME')
app.config['MAIL_PASSWORD'] = os.environ.get('MAIL_PASSWORD')

db = SQLAlchemy(app)
mail = Mail(app)
bootstrap = Bootstrap(app)
manager = Manager(app)
migrate = Migrate(app, db)

manager.add_command('db', MigrateCommand)

class Role(db.Model):
    __tablename__='roles'
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(64), unique=True)
    
    
    def __repr__(self):
        return '<Role %r>' % self.name
    users = db.relationship('User', backref='role',lazy='dynamic')

class User(db.Model):
    __tablename__='users'
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(64), unique=True, index=True)
    
    def __repr__(self):
        return '<User %r>' % self.username
    role_id = db.Column(db.Integer, db.ForeignKey('roles.id'))
        
class NameForm(FlaskForm):
    name = StringField('你的名字?', validators=[Required()])
    suibmit = SubmitField('Submit')

@app.route('/', methods=['GET','POST'])
def index():
    form = NameForm()
    if form.validate_on_submit():
        user = User.query.filter_by(username=form.name.data).first()
        if user is None:
            user = User(username = form.name.data)
            db.session.add(user)
            session['known'] = False
        else:
            session['known'] = True
        #old_name = session.get('name')
        #if old_name is not None and old_name !=form.name.data:
        #    flash('看起来你不是同一个人~')
        session['name'] = form.name.data
        form.name.data=''
        return redirect(url_for('index'))
    return render_template('index.html', form=form, name=session.get('name'), known = session.get('known', False))

@app.route('/user/<name>')
def user(name):
    return render_template('user.html', name=name)

@app.errorhandler(404)
def page_not_found(e):
    return render_template('404.html'), 404

@app.errorhandler(500)
def internal_server_error(e):
    return render_template('500.html'), 500


def make_shell_context():
    return dict(app=app, db=db, User=User, Role=Role)
manager.add_command("shell", Shell(make_context=make_shell_context))

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

if __name__ == '__main__':
    db.create_all()
    manager.run()

环境变量设定：

set MAIL_USERNAME=Gmail username
set MAIL_PASSWORD=Gmail password

shell会话内容：
from flask_mail import Message
from hello import mail
msg = Message('test subject', sender='you@example .com', recipients=['you@example .com'])
msg.body = 'text body'
msg.html = 'HTML body'
with app.app_context():

mail.send(msg)

然而报错：socket.gaierror: [Errno 11002] getaddrinfo failed

求解？？？？？

补充：我把一些Gmail的配置改成了QQ的，一次成功了。请问这是为什么，搜索了一下说是墙的问题，但是我翻墙了，可以正常访问谷歌啊，也有说是Gmail二次验证的问题，但是这个我没有开啊。