Hi TEO Bs,
Thank you for responding to let me know more about your situation.
X-SID-PRA: @HOTMAIL.COM——@HOTMAIL.COM Is this your outlook account please? If not, then this could be the hacker's actual email address, which you can add to the blocked senders and report this email to abuse@ outlook.com. If this is your own email address then it could be the hacker performing an automatic forwarding operation. You can check this by doing the following:
I know it shouldn't be possible for you to manually perform this action yourself so that you can check if someone has changed your email forwarding settings and rules.
- Sign in to Outlook Web.
- Click the gear icon in the top right corner to enter the email settings.
- Go to Mail > Forwarding and make sure forwarding is turned on.

- Go to Mail > Rules and make sure that forwarding rules are configured.

I'm sure this can't be a forwarding process that you set up yourself, so disable it and delete any email addresses you don't recognize.
If you would like to view the login activity log, you can click: https://account.live.com/activity
There is another way to prevent hackers from logging into your account:
Remove the login permissions for your current account name.
This issue can be very effective in stopping intruders who already know your account name. To do this, click on this link (https://account.microsoft.com/)and sign in to your Microsoft account, then click [Your Info] on the left and then [Edit account info] on the right side of the screen that opens. In this interface, you can add an alias for your account as a new login name.

Due to the current security risks associated with your account, I recommend that you create an alias with a outlook.com extension that doesn't require authentication. (If you are using the custom alias below, you will be prompted to verify that this alias exists. Only actual mailboxes can be added as aliases.) You will then need to click [Make Primary] to the right of your new alias to make it the primary alias.

To add aliases if you still don't understand them, see Add or remove an email alias in Outlook.com - Microsoft Support
Important: After adding a new primary alias, please do not delete your original primary alias, especially not the email address of the Microsoft domain name, after deletion the account will be completely deleted, as well as all Microsoft products purchased through the account, this process is irreversible, once again, do not delete the original primary alias!
After that, click [Change sign-in preferences] at the bottom to remove the checkmark in front of your current account name. You have successfully removed the login permissions for your account name. You can test this by typing your account name into the login screen, where Microsoft will alert you that the username doesn't exist, which will prevent you from logging in, which is the same as someone trying to hack into your account. Please note that in this case, you will not be able to log in yourself with this account name. Please remember your changed account name. In addition, we have tested that you can still send and receive emails with this account name, and that the sender can use your account name as the recipient of the email and that the email functionality is not affected.


Right now, as soon as you remove email addresses (from hackers) that you don't recognize, you're completely blocking the forwarding behavior, which is by far the most important and effective thing for you! 😊
Thank you for your patience and support. I hope the above information is helpful to you. Feel free to let me know how it went by answering below.
Best regards
Vivian - MSFT | Microsoft Community Support Specialist