Any notice, payment, remittance or other filing required to be made to Riverside pursuant to any tax ordinance shall be considered late unless it is: a) physically received by Riverside on or before the due date, or b) received in an envelope or other container displaying a valid, readable U.S. postmark dated on or before the due date, properly addressed to the village of Riverside, with adequate postage prepaid. (Ord. 2354, 12-4-2000)