How to block the mail after sending it

I think there may be a bit of confusion here!

Unfortunately, it's not possible to block or recall a physical letter or package after it's been sent through the mail. Once a letter or package is sent, it's out of your control and in the hands of the postal service.

However, there are a few scenarios where you might want to "block" or recall a mail piece:

  1. Undeliverable mail: If you've sent a letter or package to an incorrect address, you can contact the postal service and request that they return the mail piece to you. This is usually done by filling out a change of address form or contacting the post office directly.
  2. Recall a package: If you've sent a package and realize you need to recall it, you can contact the shipping carrier (e.g., USPS, UPS, FedEx) and request that they intercept the package. This may involve paying a fee and providing proof of ownership.
  3. Stop mail delivery: If you're moving or no longer want to receive mail at a specific address, you can contact the post office and request that they stop mail delivery to that address.

To block or recall mail, you'll need to contact the relevant authorities, such as:

Keep in mind that there may be fees associated with recalling or stopping mail delivery, and the process may take some time.