初始化代码：

app = create_app()
# mail client
mail = Mail(app)

配置文件：

# flask_mail
MAIL_DEBUG = False
MAIL_SUPPRESS_SEND = False
MAIL_SERVER = 'smtp.qq.com'
MAIL_PORT = 465
MAIL_USE_SSL = True
MAIL_USE_TLS = False
MAIL_USERNAME = os.getenv("MAIL_USERNAME") or "[email protected]"
MAIL_PASSWORD = os.getenv("MAIL_PASSWORD") or "xxxxxxxxxxx"	# QQ 邮箱授权码

发送邮件代码：

@celery.task
def send(mail_from, mail_to, subject="", content="", html=""):
    try:
        msg = Message(
            subject=subject,
            sender=mail_from,
            recipients=[mail_to]
        )
        msg.body = content
        msg.html = html

        mail.send(msg)
    except Exception as e:
        return e.__str__()

    return "ok"

send.delay("[email protected]", "[email protected]", "test", "content")

错误信息：

(535, b'Login Fail. Please enter your authorization code to login. More information in              
                    http://service.mail.qq.com/cgi-bin/help?subtype=1&&id=28&&no=1001256')                              

不知道哪里出了问题，到网上搜了一圈，这个配置没错，就是账户验证失败，就很难受。