I’m experiencing the very same or very similar issue.
As admin I can sent a test email to outside & real address but when I try to register with that very (or any) address then… nothing happens.
I have control over the mail server and as I’m looking at its logs - as for user registration or as if admin re-sending activation email - it appears that there is no attempt to communicate, to connect to mail server.
Without debugging Discourse logs:
Started POST "/u/action/send_activation_email" for 10.3.9.144 at 2023-08-29 18:34:14 +0000 Processing by UsersController#send_activation_email as */* Parameters: {"username"=>"lemko"} Rendered text template (Duration: 0.0ms | Allocations: 1) Completed 200 OK in 39ms (Views: 1.6ms | ActiveRecord: 0.0ms | Allocations: 2848)
I’m novice so go easy on me when ask - this is not because I do not have sidekiq right?