625 ILCS 5/2-114
Whenever the Secretary of State is authorized or required to give any notice under this Act or other law regulating the operation of vehicles, unless a different method of giving such notice is otherwise expressly prescribed, such notice shall be given either by personal delivery thereof to the person to be so notified or by deposit in the United States mail of such notice in an envelope with postage prepaid, addressed to such person at his address as shown by the records of the Office of the Secretary of State. The giving of notice by mail is complete upon the expiration of 4 days after such deposit of said notice. Proof of the giving of notice in either such manner may be made by the certificate of any officer or employee of the Secretary of State or affidavit of any person over 18 years of age, naming the person to whom such notice was given and specifying the time, place and manner of the giving thereof.
The Secretary may include with the notice any material, from any source, relating to the donation of any vehicle to any charitable not-for-profit organization that is exempt from federal income taxation under Section 501(c)(3) of the Internal Revenue Code.
625 ILCS 5/2-114