Configure QQ Mail sending, email arrives normally, but Discourse reports errors and sends duplicates

qi_lu · January 3, 2026, 1:24pm

The installation tutorial I initially followed:

My settings:

  DISCOURSE_DEVELOPER_EMAILS: 'xxx@gmail.com'

  ## TODO: Configure the mail server
  ##       (used for validation of new accounts, notifications, digests, etc.)
  ## required: hostname of the SMTP mail server used to send mail
  DISCOURSE_SMTP_ADDRESS: smtp.qq.com
  ## uncomment to set the port to something other than the default (25)
  DISCOURSE_SMTP_PORT: 587
  ## USER_NAME / PASSWORD required if the SMTP provider needs authentication
  ## WARNING: a '#' in the SMTP password can be misinterpreted; ensure it's inside string quotes, e.g.:
  ##   DISCOURSE_SMTP_PASSWORD: "#pass#ord"
  DISCOURSE_SMTP_USER_NAME: xxx@qq.com
  DISCOURSE_SMTP_PASSWORD: "xxx"
  ## uncomment to enable implicit TLS at connection time, probably needed for using port 465
  #DISCOURSE_SMTP_FORCE_TLS: true
  ## uncomment to set the HELO/EHLO domain, only set if required by provider
  #DISCOURSE_SMTP_DOMAIN: discourse.example.com
  ## the address from which notifications are sent
  DISCOURSE_NOTIFICATION_EMAIL: xxx@qq.com
  ## uncomment to change server certificate verification
  #DISCOURSE_SMTP_OPENSSL_VERIFY_MODE: peer # peer|none
  ## uncomment to override the authentication method
  DISCOURSE_SMTP_AUTHENTICATION: login # plain|login|cram_md5

Situation 1:

When trying user registration, Discourse repeatedly sends emails.

I had to manually terminate the retry job in sidekiq.

Situation 2:

I tried using the internal test email.
An error prompt appears after clicking send.
However, when I check my mailbox, the email successfully arrived.

If someone can help me solve this puzzle, I will continue to use QQ Mail, otherwise I will have to try changing the email provider.

Moin · January 3, 2026, 2:46pm

Are there errors in yourforum.com/logs?

You problem reminds me of 我搭建了discourse，激活了账户邮箱，为什么还是每隔一会儿不断发送激活账户信息的邮件？？怎么配置解决这个bug - #23 by supermathie and Duplicate registration email issue

qi_lu · January 4, 2026, 2:19am

Thank you for the reply. The two examples you provided are almost identical to my situation. I have carefully reviewed the relevant content, but I still cannot figure out how to solve it.

There are indeed errors in the logs.

ducks · January 5, 2026, 4:55pm

howdy, sorry about that. I am working on fixing this to provide actual error messages. I will reply here when merged.

ducks · January 7, 2026, 4:40pm

howdy again, the PR has been merged. once you have the updated code, please let me know if you are still not seeing a human readable error message.

qi_lu · January 8, 2026, 4:06am

This is the record of me running doctor
https://mathcollapse.20000816.xyz/ZWM4MzAzZjUzZDZjMGU1.txt

This is the error log after the update

Message (2 copies reported)

SMTP Error Net::SMTPUnknownError with message: 
 response: 


Backtrace

/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/activesupport-8.0.4/lib/active_support/broadcast_logger.rb:218:in `block in dispatch'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/activesupport-8.0.4/lib/active_support/broadcast_logger.rb:217:in `map'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/activesupport-8.0.4/lib/active_support/broadcast_logger.rb:217:in `dispatch'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/activesupport-8.0.4/lib/active_support/broadcast_logger.rb:129:in `error'
/var/www/discourse/lib/email/sender.rb:308:in `rescue in send'
/var/www/discourse/lib/email/sender.rb:295:in `send'
/var/www/discourse/lib/tasks/emails.rake:230:in `block in <main>'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/task.rb:279:in `block in execute'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/task.rb:279:in `each'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/task.rb:279:in `execute'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/task.rb:219:in `block in invoke_with_call_chain'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/task.rb:199:in `synchronize'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/task.rb:199:in `invoke_with_call_chain'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/task.rb:188:in `invoke'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/application.rb:188:in `invoke_task'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/application.rb:138:in `block in top_level'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/application.rb:138:in `each'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/application.rb:138:in `block in top_level'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/application.rb:147:in `run_with_threads'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/application.rb:132:in `top_level'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/application.rb:83:in `block in run'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/application.rb:214:in `standard_exception_handling'
/var/www/discourse/vendor/bundle/ruby/3.3.0/gems/rake-13.3.1/lib/rake/application.rb:80:in `run'
bin/rake:13:in `<top (required)>'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli/exec.rb:59:in `load'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli/exec.rb:59:in `kernel_load'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli/exec.rb:23:in `run'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli.rb:452:in `exec'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor/command.rb:28:in `run'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor.rb:538:in `dispatch'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli.rb:35:in `dispatch'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/vendor/thor/lib/thor/base.rb:584:in `start'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/cli.rb:29:in `start'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/exe/bundle:28:in `block in <top (required)>'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/lib/bundler/friendly_errors.rb:117:in `with_friendly_errors'
/usr/local/lib/ruby/gems/3.3.0/gems/bundler-2.6.4/exe/bundle:20:in `<top (required)>'
/usr/local/bin/bundle:25:in `load'
/usr/local/bin/bundle:25:in `<main>'

Thank you for your help, but I still cannot resolve the QQ mailbox issue, so I had to switch to a Gmail account, and now it is completely normal.

sniper756 · January 8, 2026, 2:16pm

QQ Mail doesn’t work, I’m having the same issue. Using Mailgun can solve the problem.

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Configure QQ Mail sending, email arrives normally, but Discourse reports errors and sends duplicates

The installation tutorial I initially followed:

My settings:

Situation 1:

Situation 2:

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