It is ok for the ordinary mails like family letters, magazines etc. But sometimes if you buy some rather big items online, they will not send them to a P.O. Box. But packages from family and friends are ok. There might be some other important cases the senders don't want to send the important information to a P.O Box becasue they want to know the identity of the receiver, at least has a home address so they could track. You probably need to ask the postal office to make sure what kind of importa