ok - this is what is in the header - i wanted you to change addresses so spammers don't find them. (I will delete the file next.)
The two problem addresses are in bold. Not only are there two addresses, but they are in two different subdomains (return and edm). You need both addresses on the safe list, or the full domains, back to the @.
From: "Catch" <firstname.lastname@example.org>
the server isn't marking it as spam, looks like it is definitely outlook doing it.
X-Spam-Status: No, score=0.8 required=10.0
T_MONEY_PERCENT autolearn=disabled version=3.4.1
X-Greylist: from auto-whitelisted