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

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

所有跟帖： 

• Ask the Post office whether you can do that. -863211- ♂ (0 bytes) () 03/11/2010 postreply 15:03:47

• 完全沒問題, 每年4/15保稅的時候, 很多人要IRS簽名回執的 -newbieseller- ♂ (0 bytes) () 03/12/2010 postreply 11:25:38