Illinois Proof Of Mailing and Publication is a document which certifies that a document has been sent out or published. It is notarized by a third-party witness and is legally binding. There are two main types of Illinois Proof Of Mailing and Publication: Proof of Mailing and Proof of Publication. Proof of Mailing involves providing evidence that a document has been sent out to the relevant parties. This generally includes the date of mailing, the name and address of the recipient, and the name of the sender. Proof of Publication is used to certify that a document has been published in a newspaper, magazine, or other medium. It must include the date and time of publication, the title of the document, and the name of the publication in which it was published. In both cases, the notarized document must be signed by both the sender and the recipient, or the publisher and the sender, depending on the type of proof. This document can be used to provide legal proof that the document was sent out or published.