I can send emails, but far too many get sent, and the backend still returns errors

What should I do? Help… I’m really in a hurry

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I didn’t censor anything to make things clearer, but please don’t mess around with this.

QQ Personal Email has rate limits. Please build your own enterprise email or purchase an email push service.

Also, do not publish sensitive information in public places. Please change your QQ email password immediately!

In other words, the emails I sent were actually dispatched, but the system determined they hadn’t been sent. The root cause is a problem with QQ Mail, isn’t that right?

Most likely

Alright, thank you (though I’ve seen many tutorials where people also seem to use QQ)

Could you explain how to set up a proxy for Discourse on a domestic Chinese server, or any other alternative methods?

Figure this out on your own