Configure SMTP in Docker container

Hi @pfaffman @Falco

many thanks for your input.

This is how my environment variables look like

discourse:
  extraEnvVars:
    - name: DISCOURSE_SMTP_ADDRESS
      value: "smtp-relay.sendinblue.com"
    - name: DISCOURSE_SMTP_PORT
      value: "587"
    - name: DISCOURSE_NOTIFICATION_EMAIL
      value: "no-reply@my-domain.com"
    - name: DISCOURSE_SMTP_USER_NAME
      value: "my-email@googlemail.com"
    - name: DISCOURSE_SMTP_PASSWORD
      value: "my-pw"
    - name: DISCOURSE_SMTP_DOMAIN
      value: "my-domain.com"

and after that the container came up. I tried to send a test e-mail to my gmail account from the admin panel. This is what I got:

So it does not work by now.

These are the logs from the Discourse container:

Processing by Admin::UsersController#show as JSON
  Parameters: {"id"=>"1"}
Completed 200 OK in 1978ms (Views: 0.6ms | ActiveRecord: 0.0ms | Allocations: 195416)
Started GET "/groups/search.json" for 10.0.0.50 at 2022-08-10 11:55:05 +0000
Processing by GroupsController#search as JSON
Completed 200 OK in 1189ms (Views: 0.5ms | ActiveRecord: 0.0ms | Allocations: 133325)
Started GET "/admin/email.json" for 10.0.0.50 at 2022-08-10 11:55:17 +0000
Processing by Admin::EmailController#index as JSON
Completed 200 OK in 23ms (Views: 1.2ms | ActiveRecord: 0.0ms | Allocations: 864)
Started POST "/admin/email/test" for 10.0.0.50 at 2022-08-10 11:55:20 +0000
Processing by Admin::EmailController#test as */*
  Parameters: {"email_address"=>"test@gmail.com"}
Completed 422 Unprocessable Entity in 20ms (Views: 1.1ms | ActiveRecord: 0.0ms | Allocations: 2037)
Started GET "/about.json" for 10.0.0.47 at 2022-08-10 11:55:46 +0000
Processing by AboutController#index as JSON
Completed 200 OK in 67ms (Views: 0.3ms | ActiveRecord: 0.0ms | Allocations: 9503)
Started GET "/site/basic-info.json" for 10.0.0.47 at 2022-08-10 11:55:46 +0000
Processing by SiteController#basic_info as JSON
Completed 200 OK in 254ms (Views: 0.5ms | ActiveRecord: 0.0ms | Allocations: 33103)
Started GET "/site/basic-info.json" for 10.0.0.47 at 2022-08-10 11:55:47 +0000
Processing by SiteController#basic_info as JSON
Completed 200 OK in 80ms (Views: 0.8ms | ActiveRecord: 0.0ms | Allocations: 4260)

Do you know what I could do differently?