烧瓶邮件错误：标题= [self.sender，self.reply_to] + self.recipients

Posted 2023-02-25

【中文标题】烧瓶邮件错误：标题= [self.sender，self.reply_to] + self.recipients

【英文标题】：flask mail error: headers = [self.sender, self.reply_to] + self.recipients

【发布时间】：2017-08-07 06:10:05

【问题描述】：

我应该解释为什么我的问题不是重复的：TypeError: can only concatenate list (not "str") to list

...所以它不是重复的，因为该帖子处理代码中出现的连接运算符 +；而我的问题是错误消息中有该运算符，但代码中没有。

这是相关的 Flask 代码，我查看了回溯（如下所示）...看起来像

mail.sent(msg)

line 是攻击发生的地方。我已经非常努力地解决这个问题，显然味精的内容有问题......但我不知道是什么。任何帮助将不胜感激！

            token = s.dumps(form.email.data, salt='email-confirm')
            subject = 'subject goes here'
            msg = Message(subject=subject, sender='[e-mail]',
                          recipients=form.email.data)
            link = url_for('confirm_email', token=token, _external=True)
            pull_row = User.query.filter_by(email=form.email.data).first()
            firstname = pull_row.firstname
            msg.html = render_template("email_confirmationemail.html", link=link, name=firstname)
            mail.send(msg)
            return redirect(url_for('checkyouremail'))

这是回溯

2017-08-07T06:00:05.982678+00:00 app[web.1]: Traceback (most recent call last):
2017-08-07T06:00:05.982679+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/sync.py", line 130, in handle
2017-08-07T06:00:05.982680+00:00 app[web.1]:     self.handle_request(listener, req, client, addr)
2017-08-07T06:00:05.982681+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/gunicorn/workers/sync.py", line 171, in handle_request
2017-08-07T06:00:05.982681+00:00 app[web.1]:     respiter = self.wsgi(environ, resp.start_response)
2017-08-07T06:00:05.982682+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1836, in __call__
2017-08-07T06:00:05.982682+00:00 app[web.1]:     return self.wsgi_app(environ, start_response)
2017-08-07T06:00:05.982683+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1820, in wsgi_app
2017-08-07T06:00:05.982684+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1403, in handle_exception
2017-08-07T06:00:05.982684+00:00 app[web.1]:     response = self.make_response(self.handle_exception(e))
2017-08-07T06:00:05.982685+00:00 app[web.1]:     reraise(exc_type, exc_value, tb)
2017-08-07T06:00:05.982686+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
2017-08-07T06:00:05.982686+00:00 app[web.1]:     raise value
2017-08-07T06:00:05.982687+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1817, in wsgi_app
2017-08-07T06:00:05.982688+00:00 app[web.1]:     response = self.full_dispatch_request()
2017-08-07T06:00:05.982689+00:00 app[web.1]:     rv = self.handle_user_exception(e)
2017-08-07T06:00:05.982688+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1477, in full_dispatch_request
2017-08-07T06:00:05.982690+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1381, in handle_user_exception
2017-08-07T06:00:05.982691+00:00 app[web.1]:     reraise(exc_type, exc_value, tb)
2017-08-07T06:00:05.982691+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/_compat.py", line 33, in reraise
2017-08-07T06:00:05.982692+00:00 app[web.1]:     raise value
2017-08-07T06:00:05.982692+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1475, in full_dispatch_request
2017-08-07T06:00:05.982693+00:00 app[web.1]:     rv = self.dispatch_request()
2017-08-07T06:00:05.982694+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask/app.py", line 1461, in dispatch_request
2017-08-07T06:00:05.982695+00:00 app[web.1]:   File "/app/app.py", line 213, in login
2017-08-07T06:00:05.982695+00:00 app[web.1]:     return self.view_functions[rule.endpoint](**req.view_args)
2017-08-07T06:00:05.982696+00:00 app[web.1]:     mail.send(msg)
2017-08-07T06:00:05.982697+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask_mail.py", line 492, in send
2017-08-07T06:00:05.982697+00:00 app[web.1]:     message.send(connection)
2017-08-07T06:00:05.982698+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask_mail.py", line 427, in send
2017-08-07T06:00:05.982698+00:00 app[web.1]:     connection.send(self)
2017-08-07T06:00:05.982699+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask_mail.py", line 181, in send
2017-08-07T06:00:05.982700+00:00 app[web.1]:     if message.has_bad_headers():
2017-08-07T06:00:05.982700+00:00 app[web.1]:   File "/app/.heroku/python/lib/python3.6/site-packages/flask_mail.py", line 400, in has_bad_headers
2017-08-07T06:00:05.982701+00:00 app[web.1]:     headers = [self.sender, self.reply_to] + self.recipients
2017-08-07T06:00:05.982704+00:00 app[web.1]: TypeError: can only concatenate list (not "str") to list

【问题讨论】：

TypeError: can only concatenate list (not "str") to list的可能重复

【参考方案1】：

所以这就是解决我遇到的问题的方法。 （这是关于 Message 中的收件人参数）。我只有一个收件人。但我想会有很多收件人。无论如何，将我的一个收件人从一个字符串更改为一个列表就可以了。 例如从

recipients=email

到

recipients=email.split()

解决了这个问题。我是烧瓶邮件的新手，我没有三思而后行地为收件人使用字符串。

【讨论】：

你是对的。收件人必须始终是一个列表。

我使用recipients=[form.email.data] 作为正在输入表单的电子邮件。

我根据你的建议实现了这个if type(recipients) is list: msg.recipients = recipients else: msg.recipients = recipients.split()

谢谢@Chockomonkey，收件人必须是一个列表:)

【参考方案2】：

我今天遇到了同样的问题，这是我如何解决的。

recipient = request.form.get("email")
Message(subject=subject, recipients=[recipient]

即使您有收件人，也应将收件人作为列表传递。

参数：

收件人 - 电子邮件地址列表

API