How to turn off email forwarding that I did not set.

Found the reason from other post. At lease it work for me.

In Classic Outlook(I use web version), there is Forwarding Bar be show if you have forwarding rule (Setting -> Mail -> Rules) even you set filter like Subject, Sender, etc.

If you have this issue, you need to edit the rule and check every rule.

Disable it if you find it.

Also posted on Q&A as:

https://learn.microsoft.com/en-us/answers/questions/5985006/how-to-turn-off-email-forwarding-that-i-did-not-se

I'm having the same issue.  My forwarding message says it's going to my wife, but I have closely checked my rules--and after nearly 30 years I have quite a few--but I don't generally forward anything and certainly none to her. (I also checked her email and none of my messages are going to her.)  As far as I can tell, I do NOT have forwarding enabled, but if it is enabled, I don't know where (registry, maybe?) to look for it?  Suggestions?  (I also delay installing Patch Tuesday updates for 15 days, but I don't think it came from there...but I really don't know.)

If you notice unauthorized email forwarding, check your mail settings for unfamiliar forwarding rules and remove them immediately. Also change your password and enable 2FA for added security.

Ok,  There were no auto forwarding settings set to "on" from android app, web outlook, nor "new" outlook.  So I went through every rule I had in that account and there are lots and lots of them after 20+ years making them as mail came in.  I found one almost at the bottom of the list, "Medium Amanda" wasn't set to "forward" in words, but was set to "re-route" them to that forwarded address.  Which I have deleted and is now gone.  I have NO idea where that came from.  At any rate, it's now gone.   Thank You all for the replies and pointing to the rules area.  I'm going through them now and removing ones that are of no value any longer and also removing the "stop processing rules" option.

Dennis5mile

P.S.  I'd mark you all as "mark as solution" but that is not allowed, so pls know you all helped. 

You don't happen to synch devices do you?  I was just thinking it may be set up on another device such as your phone, and once you share across your devices, it's moved around some. 

The Mail Tip indicates that it is being forwarded via a message rule.

File-> Manage Rules & Alerts

How many rules do you have configured?

You can check their actions in the bottom pane. Is one set to forward?

If not, are you using Outlook with an Outlook.com account a business account (Exchange) or something else?

The email forwarding is a business setting usually, but can be used anywhere. If you have a proxy server that you use for security and privacy, then your email would go there and be forwarded to you.

  Go to the Outlook website or open the Outlook app.

  Click the Settings (gear) icon in the top-right corner.

  Select Mail from the left menu, then click Forwarding.

  Clear the Enable forwarding checkbox or switch the toggle to Off.

https://www.google.com/search?q=how+do+i+turn+off+email+forwarding+in+outlook&rlz=1C1GEWG_enCA951CA951&oq=how+do+I+turn+off+email+forwarding&gs_lcrp=EgZjaHJvbWUqBwgAEAAYgAQyBwgAEAAYgAQyBggBEEUYOTIHCAIQABiABDIICAMQABgWGB4yCAgEEAAYFhgeMggIBRAAGBYYHjIICAYQABgWGB4yCggHEAAYChgWGB4yCAgIEAAYFhgeMggICRAAGBYYHtIBCTExODYxajBqN6gCCLACAfEFJAQVWLE_oPo&sourceid=chrome&source=chrome.ob&ie=UTF-8#fpstate=ive&vld=cid:a2c86e4f-0f54-4fcc-ba5d-c48323b97ce9_7a0f7a63,vid:f-6jZKbhKaY,st:1

As for experience, I've been working with computers since the mid 1980s and am currently enrolled in the Cybersecurity Specialist field. I do have a little experience with computers in several formats. Enjoy your night/day.