Is there a possibility to move the eMail I just create the task from to a (pre defined) folder. So it's out of my inbox?
Manually, you can move it to a different folder anytime, but there's unfortunately no option that it would get moved automatically as you add it to Todoist.
We will look into adding such option (if possible) in the future and you're welcome to request it in our Votebox: https://todoist.com/Vote/
I set up a quick step in outlook to email the task to the project and move it to the folder - then it's done in 2 clicks :-)