不会收到正式信件，却是别的东西吧
Application Type: I485 , APPLICATION TO REGISTER PERMANENT RESIDENCE OR TO ADJUST STATUS
Current Status: Approval notice sent.
On December 27, 2006, we mailed you a notice that we have approved this I485 APPLICATION TO REGISTER PERMANENT RESIDENCE OR TO ADJUST STATUS. Please follow any instructions on the notice. If you move before you receive the notice, call customer service.
If you have questions or concerns about your application or the case status results listed above, or if you have not received a decision from USCIS within the current processing time listed*, please contact USCIS Customer Service at (800) 375-5283.
*Current processing times can be found on the USCIS website at www.uscis.gov under Case Status & Processing Dates.
*** Please do not respond to this e-mail message.
Sincerely,
The U.S. Citizenship and Immigration Services (USCIS)