If you have decided that you no longer want your mail delivered by the United States Postal Service, there are a few steps that you need to take in order to cancel your service. First, you will need to visit the USPS website and sign in. From here, you will be able to access your account information and make changes if necessary. Next, you will need to contact the postal service directly. You can do this by calling them at 1-800-ASK-USPS or by filling out a form online. Once you have contacted the postal service, they will need to provide proof of your cancellation. This can be done in a number of ways, but most likely it will involve sending them a letter or email. Once everything has been confirmed, the postal service will stop delivering your mail and any pending orders will be cancelled as well. ..