The Iowa Affidavit of Making Notice is a document that is used to notify the recipient of a package or letter that the sender has used a specific mailing method to send the package or letter. This document is typically used when the sender needs proof that the package or letter was sent in a timely manner. There are two types of Iowa Affidavit of Making Notice: the Certificate of Mailing and the Registered Mail Affidavit. The Certificate of Mailing is used when the sender has used the United States Postal Service's regular first-class mail, certified mail, or registered mail services. The Registered Mail Affidavit is used when the sender has used the United States Postal Service's registered mail service. Both affidavits must include the sender's name, address, date of mailing, mail service used, and package or letter description in order to be valid.