Body
Summary
Messages that are forwarded will appear to be forwarded from you. When you reply to a message that has been forwarded, the reply will be sent to the address the message was forwarded from, not to the original sender.
How to: Turn Off Mail Forwarding in Outlook
-
In Outlook Web App, click Settings 
> Mail > Forwarding
-
To turn off forwarding, clear Enable forwarding and select Save.