Salt Lake City UT 84116. Phone: 801-522-7000.Post Officeâ„¢. Share. You've received your acceptance letter and it's time to complete the next steps toward enrollment. Learn more about how you can communicate with a prisoner in four different ways: phone, voicemail, email, and mail. Just fill out the online application, and you're on your way. For example, my dad sent important documents up to me, certified usps took 1 to 3 business days each time. The TSA agent walked them over there with me and put them in the box once I was done filling out the info and paying for the service. Keep in mind, filling out these worksheets and forms is NOT equivalent to applying for a permit. We will accept only one letter per person in any 30day period.