The Wisconsin Affidavit of Mailing is a document that is used to certify that documents have been sent by mail to a specific address. It is commonly used to certify service of process by a third party, to prove that certain documents were sent to an individual. The Wisconsin Affidavit of Mailing must be completed by the individual who sent the documents, and must include the details of the mailing, such as the date, address, type of mail, and a description of the documents sent. There are three types of Wisconsin Affidavit of Mailing: Standard, Certified Mail, and Express Mail. The Standard Affidavit of Mailing is the most commonly used type and must be signed by the sender, while the Certified and Express Mail Affidavits must also include a tracking number and proof of delivery.