Wrong Alternate Email causing Error of 550 !


New Email
I saw Yesterday that in my yahoo recovery email list it has been added a strange and unknown email of oulook with this form : ******.1992@outlook.com. I was receiving a feedback that whenever my friends send me an email they were getting an error of this form :

Remote host said:
550 Requested action not taken: mailbox unavailable

I am absolutely wondering and I couldn't solve this problem until now. I have changed my recovery list of emails and there is no more this strange email, but yet when a person sends me an email he has this problem.

Can any body help me ? Thanks a lot