When I receive an email the sender receives an undeliverable message from an unknown address to me.

Question

When I receive an email the sender receives an undeliverable message from an unknown address to me.

I also get a copy of the undeliverable message into my junk folder.

There are no forward on rules set up.

See below the exact message received....

Delivery has failed to these recipients or groups:

******@hotmail.com The recipient's mailbox is full and can't accept messages now. Please try resending your message later, or contact the recipient directly.

Answer 1

You provided a subsequent answer, however when I click the link to see it I get a page not found?

Answer 2

Appreciate the details. There was no rules or conditional formatting, nothing on Forwarding and IMAP Followed all information, but issue persists?

Then went to account and removed one alias.

Removed existing app passwords

Then changed password, 2 step verification was already enabled.

No devices to remove

Went to security, there wasn't an option to 'sign out everywhere,' but I did sign out and then sign in again and sent myself an email. The same undeliverable message was received into the junk folder?

Answer 3

Hello,

Make sure you do this on a computer, not on smartphone or tablet. Go to https://www.outlook.com and log in, click on the gear icon on the top right to launch the settings.

Then, on the Mail tab, go to Rules. Are there any rules set up here? If yes, delete them all.

Then check the conditional format, again, if it's there, delete it.

Then, check Forwarding and IMAP, If any items are present, delete them as well.

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If you can't find anything, go to https://account.live.com > Your info > Sign in Preferences. Make sure to check all the aliases here. If you don't recognize any there, delete it.

Then go to Security > Manage How I sign in, make sure all contact info is yours. Then scroll down on the same page, look under App Password, click on remove existing app passwords as well.

Please make sure you change your password and enable two-step verficiation.

Go to your account online, go to Devices, remove any devices you don't recognize.

Then go to Security, click on Sign out everywhere. This is meant to kill any session that's still connected. Unfortunately, this one will take 24 hours to take effect.