To stop mail forwarding, have the recipient follow these steps. On the Outlook on the web Options page, go to the Forwarding ...

Office 365

To stop mail forwarding, have the recipient follow these steps..
On the  Outlook on the web Options page, go to the Forwarding section, which is under Accounts.
Choose Stop forwarding.
Choose Save.

If they don't see Forwarding under Accounts, their mail is probably being forwarded due to an inbox rule. For more information on changing inbox rules, see Inbox rules in Outlook.

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