If the sender didn't expect the mail to be forwarded, ask them to follow these steps to stop forwarding messages to another ...

Office 365

If the sender didn't expect the mail to be forwarded, ask them to follow these steps to stop forwarding messages to another email address:In Outlook on the web, on the Options page, go to Mail > Accounts > Forwarding. (See Note.)
Choose Stop forwarding.
Choose Save.
Note: If you don't see Forwarding under Accounts, then your mail is probably being forwarded due to an Inbox rule. For more information on changing Inbox rules, see Organize mail using Inbox rules in Outlook on the web.

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