can I send certified letter and ask for signature for PO box?

來源: 於 2010-03-11 12:13:38 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

Can I mail Certified first-class letter to P.O.Box address and ask for sigature back?
I know I can ask for delievery confirmation for P.O.box