Arizona Affidavit of Service by Certified Mail is a legal document used to prove that a particular document was delivered to a certain individual or entity by certified mail. It is used to prove that a court filing, notice, or other document was delivered to the recipient in accordance with the rules of service. There are two types of Arizona Affidavit of Service by Certified Mail: single-party affidavit and two-party affidavit. A single-party affidavit is used to prove service of one document on one person or entity; a two-party affidavit is used to prove service of different documents on two different people or entities. Both types of affidavit must be signed by the person who sent the certified mail and must contain the tracking number and the date the mail was sent. The recipient must sign the affidavit in order to acknowledge receipt of the documents.