Arizona Proof of Mailing of Notice of Application is a document that is sent to the Arizona Department of Transportation (ADOPT) in order to prove that the sender has sent a Notice of Application to the intended recipient. It serves as a legally-binding record of the mailing date and time of the Notice of Application, and can be used as evidence in the event of any disputes. There are two types of Arizona Proof of Mailing of Notice of Application: 1. Certified Mail: This type of Arizona Proof of Mailing of Notice of Application is provided by the United States Postal Service (USPS). It requires the sender to fill out a USPS Certified Mail Form and mail the Notice of Application along with the form to ADOPT. The USPS will provide the sender with a receipt that serves as proof of mailing. 2. Registered Mail: This type of Arizona Proof of Mailing of Notice of Application is provided by the USPS. It requires the sender to fill out a USPS Registered Mail Form and mail the Notice of Application along with the form to ADOPT. The USPS will provide the sender with a receipt and tracking number that serves as proof of mailing.