You get a lot of mail from a particular customer for instance for a specific projet.
You decide to create a folder and a mail rule to deliver mails from your customer's domain into this folder.
It should be possible to apply this ...
I'm sure You have the same problem if You have a large complex folder structure. You got a new mail, but the mail rule moves it into a folder somewhere deeeeeeep....then it's hard to find. Of course You can use "copy to folder" but then your inbox ...