However, there are a few exceptions to this rule. For example, the post office may withhold mail if:
- It is suspected to contain hazardous or illegal materials.
- The sender or recipient is under a court order that prohibits them from receiving or sending mail.
- The mail is deemed to be "undeliverable" because it is not properly addressed or the recipient cannot be found.
- The mail is deemed to be "non-mailable" because it violates postal regulations, such as being too heavy or bulky or containing prohibited items.
- There is an outstanding balance due on the recipient's postage account.
- The mail has been declared "dead mail" and has been returned to the sender.
- If you believe that your mail is being withheld without a valid reason, you can contact your local post office or postal inspector to inquire about the status of your mail and to request that it be delivered.