CriticalUserEmail (Sidekiq)

Hi! I am building a Discourse Forum but there is a tricky problem which is about email.
I am able to test the email by the email testing function implemented in Discourse.
However, when registering, I can’t recieve my email and after 2 days of searching, I known that it’s the problem of Sidekiq.


This is a screenshot from it.
I wonder for all your help.
Forgive me that my English is not that well and may have grammer mistakes.

PS: I have checked the settings and no setting will let users cannot recieve the verivication email.
Btw, I am using maddymail. I have tried sendinblue and that didn’t work either.

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