Can not delete smtp email setting

Infos:

  • Used Zammad version: latest
  • Used Zammad installation type:package
  • Operating system: debian
  • Browser + version: latest firefox and edge

Expected behavior:

Send mail via microsoft channel

Actual behavior:

Tries to send via email smtp setting

Steps to reproduce the behavior:

I can not remove the email smtp channel an idea how to remove it as it doe not have a big red button to delete it.