必须要记录下踩过的坑，一来，为后来者铺路，二来，实在摔得疼，提醒自己写代码要谨小慎微。
[Errno 11004] getaddrinfo failed
1.先排除邮箱账号和授权码的错误
测试如下代码：（注：邮箱号和授权码换成你自己的）
# -*- coding: utf-8 -*-from flask import Flaskfrom flask_mail import Mail, Messageapp = Flask(__name__)app.config[‘MAIL_SERVER‘] = ‘smtp.qq.com‘ ?# 邮件服务器地址app.config[‘MAIL_PORT‘] = 25 ?# 邮件服务器端口app.config[‘MAIL_USE_TLS‘] = True ?# 启用 TLSapp.config[‘MAIL_USERNAME‘] = ‘987654321@qq.com‘ ?app.config[‘MAIL_PASSWORD‘] = ‘nxvxvzbbbbbbbcec‘mail = Mail(app)@app.route(‘/‘)def index(): ???msg = Message(‘恭喜！排除授权码和账号的问题！‘, sender=‘987654321@qq.com‘, recipients=[‘987654321@qq.com‘]) ???msg.html = ‘<b>Hello Web</b>‘ ???mail.send(msg) ???return ‘<h1>OK!</h1>‘if __name__ == ‘__main__‘: ???app.run(host=‘127.0.0.1‘, debug=True)
2.再排查环境变量是否设置正确
打开你当前文件的虚拟环境，设置如下代码
(venv) $ set MAIL_USERNAME = my_email@qq.com(venv) $ set MAIL_PASSWORD = password
注意：：环境变量配置中不加引号！！不加引号！！不加引号！！
程序中看是否成功get到
print(os.environ.get(‘MAIL_USERNAME‘))print(os.environ.get(‘MAIL_PASSWORD‘))
能get到后，就可以在程序中获取环境变量的配置啦！
app.config[‘MAIL_USERNAME‘] = os.environ.get(‘MAIL_USERNAME‘) app.config[‘MAIL_PASSWORD‘] = os.environ.get(‘MAIL_PASSWORD‘)
3.在程序中集成发送电子邮件功能
import osfrom flask import Flask, render_template, session, url_for, redirectfrom flask_bootstrap import Bootstrapfrom flask_wtf import FlaskFormfrom wtforms import StringField, SubmitFieldfrom wtforms.validators import DataRequiredfrom flask_sqlalchemy import SQLAlchemyfrom flask_script import Managerfrom flask_script import Shellfrom flask_migrate import Migrate, MigrateCommandfrom flask_mail import Mail, Messagebasedir = os.path.abspath(os.path.dirname(__file__))app = Flask(__name__)app.config[‘SECRET_KEY‘] = ‘hard to guess string‘app.config[‘SQLALCHEMY_DATABASE_URI‘] = ????‘sqlite:///‘ + os.path.join(basedir, ‘data.sqlite‘)app.config[‘SQLALCHEMY_COMMMIT_ON_TEARDOWN‘] = Trueapp.config[‘SQLALCHEMY_TRACK_MODIFICATIONS‘] = Trueapp.config[‘MAIL_SERVER‘] = ‘smtp.qq.com‘app.config[‘MAIL_PORT‘] = 25app.config[‘MAIL_USE_TLS‘] = Trueapp.config[‘MAIL_USERNAME‘] = os.environ.get(‘MAIL_USERNAME‘)print(os.environ.get(‘MAIL_USERNAME‘))app.config[‘MAIL_PASSWORD‘] = os.environ.get(‘MAIL_PASSWORD‘)print(os.environ.get(‘MAIL_PASSWORD‘))app.config[‘FLASKY_MAIL_SUBJECT_PREFIX‘] = ‘[Flasky]‘app.config[‘FLASKY_MAIL_SENDER‘] = ‘123456789@qq.com‘ ?# 发送者邮箱app.config[‘FLASKY_ADMIN‘] = os.environ.get(‘FLASKY_ADMIN‘) ?# 接收者邮箱print(os.environ.get(‘FLASKY_ADMIN‘))bootstrap = Bootstrap(app)db = SQLAlchemy(app)manager = Manager(app)migrate = Migrate(app, db)mail = Mail(app)class NameForm(FlaskForm): ???name = StringField(‘What is your name?‘, validators=[DataRequired()]) ???submit = SubmitField(‘Submit‘)class Role(db.Model): ???__tablename__ = ‘roles‘ ???id = db.Column(db.Integer, primary_key=True) ???name = db.Column(db.String(64), unique=True) ???users = db.relationship(‘User‘, backref=‘role‘, lazy=‘dynamic‘) ???def __repr__(self): ???????return ‘<Role: %s>‘ % self.nameclass User(db.Model): ???__tablename__ = ‘users‘ ???id = db.Column(db.Integer, primary_key=True) ???username = db.Column(db.String(64), unique=True, index=True) ???role_id = db.Column(db.Integer, db.ForeignKey(‘roles.id‘)) ???def __repr__(self): ???????return ‘<User: %s>‘ % self.usernamedef send_email(to, subject, template, **kwargs): ???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) ???mail.send(msg)def make_shell_context(): ???return dict(app=app, db=db, User=User, Role=Role)manager.add_command(‘shell‘, Shell(make_context=make_shell_context)) ?# 集成python shellmanager.add_command(‘db‘, MigrateCommand) ?# 创建数据库迁移@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: ???????????new_user = User(username=form.name.data) ???????????db.session.add(new_user) ???????????db.session.commit() ???????????session[‘known‘] = False ?# 新用户（数据库中没查到你） ???????????if app.config[‘FLASKY_ADMIN‘]: ???????????????send_email(app.config[‘FLASKY_ADMIN‘], ‘New User‘, ??????????????????????????‘mail/new_user‘, user=new_user) ???????else: ???????????session[‘known‘] = True ?# 老用户 ???????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‘), 500if __name__ == ‘__main__‘: ???# manager.run() ???app.run(host=‘127.0.0.1‘, port=5200, debug=True)
4. 创建模板
new_user.html:
User {{ user.username }} has joined.new_user.txt:
User <b>{{ user.username }}</b> has joined.
5. 跑起来
(env) C:\Users\Administrator\PycharmProjects\lagou\jokertion_blog>python hello.py shell
注意：记得先在虚拟环境（venv）中设置好三个环境变量：
set MAIL_USERNAME=123456789@qq.comset MAIL_PASSWORD=xxxxxxxxxxxxxxset FLASKY_ADMIN=123456789@qq.com
6.大功告成！新增功能：新添用户，自动发送邮件提醒管理员。
记踩坑--Flask Web开发：第六章的电子邮件 ----[Errno 11004] getaddrinfo failed
原文地址：https://www.cnblogs.com/liangmingshen/p/10162153.html