Are you referring to the office itself, or a mailbox? Under what additional circumstances?
If you're referring to the actual office, it's likely you would be arrested for "disorderly conduct", and advised of criminal trespass.
Regarding mailboxes, in general, you may block your own mailbox without consequence (other than the mailman won't deliver your mail); however, blocking anyone else's may result in a civil suit or, depending on the area, be an infraction.
However, this is my knowledge in general. You would need to refer to, or specify, the statutes of your local governments.
There is an Abu Halifa Post Office at address: Block 2, Abu Halifa, Kuwait.
If you re speaking of your US mail PO box, at the post office - simply ask for it over the counter. If you are referring to a commercial post office box - they cannot withhold your mail from you. It is against Federal law.
Post office.Postal service.
Post Offices
How do i track my postal box from turkey post office
FPO = Fleet post office for Navy personel. Apo = Army post office for Army personel
Used post office vehicles, because of mileage and safety liability, are normally sent to a contracted auction block when exhausted. Check your local auction listings for dates and times of car and truck arrivals.
Main Post office (Head Post Office) to Main Post Office (Head Post Office)
Yes - it's their property and you rent it from them. If you dont pay for it or you break any rules that were on the PS1093 when you signed it, they have the right to block mail to your box. The application that you sign when you apply for a box is a legal contract.
Postal service
The plural is Post Offices
Go to the post office.