625 ILCS 5/6-211

(a) The Secretary of State shall administer the provisions of this Chapter and may make and enforce rules and regulations relating to its administration. (b) The Secretary of State shall either provide or prescribe suitable forms requisite or deemed necessary by him for the purposes of this Chapter. (c) Whenever under the provisions of this Chapter the Secretary of State is required to give notice to any person such notice shall be deemed to have been served either when personally delivered or when deposited in the United States mail, in a sealed envelope, with postage prepaid, addressed to the party affected thereby at his last known residence or place of business.