The message was forwarded to a different email address and delivered to its Inbox. To see where this message was forwarded, ...

The message was forwarded to a different email address and delivered to its Inbox. To see where this message was forwarded, the intended recipient of the message can check for forwarding settings using the following steps:
1.Sign in to Outlook on the web.
2.Select Settings > Your app settings > Mail > Accounts > Forwarding.
If forwarding is on, the forwarding email address will be displayed.
3.To turn off forwarding, select Stop forwarding, and then save any changes.
If forwarding is already turned off, there is probably an Inbox rule forwarding email to the different email address.