What does it mean?

I just got Email from uscis as follows:

Application Type: I485

Current Status: Card returned by the post office as undeliverable.

On October, 2007, the post office returned our last notice as undeliverable. Please call 1-800-375-5283 to update the mailing address.

What does it mean? I do not change my address and check mailling box everyday, how can I do next?

所有跟帖： 

• 回複：What does it mean? -Made_In_China- ♀ (130 bytes) () 11/04/2007 postreply 11:18:02

• 回複：回複：What does it mean? -jianwei02- ♂ (20 bytes) () 11/04/2007 postreply 16:21:13

• 回複：看來GC批了,但地址問題寄不到退回,建議打電話 -radiology- ♂ (41 bytes) () 11/04/2007 postreply 13:15:09

• 回複：回複：看來GC批了,但地址問題寄不到退回,建議打電話 -jianwei02- ♂ (20 bytes) () 11/04/2007 postreply 16:20:38

• 我遇到這種情況 -pharmacyelite- ♂ (108 bytes) () 11/04/2007 postreply 18:15:10

• 回複：我遇到這種情況 -jianwei02- ♂ (38 bytes) () 11/04/2007 postreply 18:57:35