just the same day got two email from USCIS
1.
Application Type: I485 , APPLICATION TO REGISTER PERMANENT RESIDENCE OR TO ADJUST STATUS
Current Status: Approval notice sent.
2.
Application Type: I485 , APPLICATION TO REGISTER PERMANENT RESIDENCE OR TO ADJUST STATUS
Current Status: Notice Returned as Undeliverable.
COULD YOU PLEASE tell me what is wrong with it. I have been living the same address for more than 7 years.