@MrGeneration okaaay…will do in the future…
anyway i solved the problem myself, just want to post the solution for others in the future…i wasted two full days on this, others shouldnt…
it is was very confusing/(unintuitive i guess), this is what youll want to do:
Do not actually chose “From”, but choose “Email” under the Customer chapter in the dropdown.
Then it actually filters stuff, also from any email client be it Outlook or Kopano…