Within five days after a Complaint is duly filed with the Commission by the Department or by an Aggrieved Party, the Commission shall cause it to be served on all Parties either personally or by depositing copies in the mail, properly addressed and posted, for certified delivery.
Ill. Admin. Code tit. 56, § 5300.620
Amended at 16 Ill. Reg. 7838, effective June 1, 1992