test_email should give better error messages

[VincentWo]

Is your feature request related to a problem?

I had a problem with email delivery and using ak test_email gave me the following error:

Traceback (most recent call last):
  File "/nix/store/nxgss4v26wrp2bysqvd032y8anb0imdx-authentik-manage/bin/.manage.py-wrapped", line 35, in <module>
    execute_from_command_line(sys.argv)
    ~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/nix/store/p91km4ph8j9chck6ry02ylazdglqbjm1-authentik-env/lib/python3.14/site-packages/django/core/management/__init__.py", line 442, in execute_from_command_line
    utility.execute()
    ~~~~~~~~~~~~~~~^^
  File "/nix/store/p91km4ph8j9chck6ry02ylazdglqbjm1-authentik-env/lib/python3.14/site-packages/django/core/management/__init__.py", line 436, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^
  File "/nix/store/p91km4ph8j9chck6ry02ylazdglqbjm1-authentik-env/lib/python3.14/site-packages/django/core/management/base.py", line 420, in run_from_argv
    self.execute(*args, **cmd_options)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/p91km4ph8j9chck6ry02ylazdglqbjm1-authentik-env/lib/python3.14/site-packages/django/core/management/base.py", line 464, in execute
    output = self.handle(*args, **options)
  File "/nix/store/vdj8f8a3v5bws1hh13dwjlzfb9hc1amq-authentik-static-workdir-deps/authentik/tenants/management/__init__.py", line 38, in handle
    self.handle_per_tenant(*args, **options)
    ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/nix/store/p91km4ph8j9chck6ry02ylazdglqbjm1-authentik-env/lib/python3.14/site-packages/django/core/management/base.py", line 111, in wrapper
    res = handle_func(*args, **kwargs)
  File "/nix/store/vdj8f8a3v5bws1hh13dwjlzfb9hc1amq-authentik-static-workdir-deps/authentik/stages/email/management/commands/test_email.py", line 41, in handle_per_tenant
    send_mail.send(message.__dict__, stage.pk).get_result(block=True)
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/nix/store/p91km4ph8j9chck6ry02ylazdglqbjm1-authentik-env/lib/python3.14/site-packages/dramatiq/message.py", line 167, in get_result
    return backend.get_result(self, block=block, timeout=timeout)
           ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/nix/store/p91km4ph8j9chck6ry02ylazdglqbjm1-authentik-env/lib/python3.14/site-packages/dramatiq/results/backend.py", line 104, in get_result
    raise ResultTimeout(message)
dramatiq.results.errors.ResultTimeout: [info about the test-email]

Seeing the "timeout", I tried debugging my network first, but it turned out to be a different error which only got logged on the worker

Describe the solution you'd like

Ideally test_email would directly report the error that caused the failed delivery.

Describe alternatives that you've considered

If the former is impossible/hard maybe either the command itself or the documentation (or both) could say where the relevant error can be found.

Additional context

I am using the unsupported authentik-nix deploy method to deploy authentik as a NixOS service, but this should not affect this particular feature.

[rissson]

those commands are indeed a bit broken for now. We'll make it better in a future release