@rami.sedhom:
Another question:
Right now it seems, that only “to” , the date and the mail text are sent to Outlook.
Would it be possible to sent the whole header, like this:

From: xy xy xy.xy@domain.com
Sent: Samstag, 9. November 2019 22:29
An: aa.bb@domain.com
Subject: bla bla

This is the mail text