Flask邮件应用程序中使用的应用程序配置(遵循MiguelGrinbergFlaskdeveloplemt书):app.config['MAIL_SERVER']='smtp.googlemail.com'app.config['MAIL_PORT']=587app.config['MAIL_USE_TLS']=Trueapp.config['MAIL_USERNAME']=os.environ.get('MAIL_USERNAME')app.config['MAIL_PASSWORD']=os.environ.get('MAIL_PASSWORD')邮件用户名和密码变量已正确设置并