"This notice or order is deemed to be served on the addressee under applicable law ten days from the date this notice or order was mailed by the commissioner as shown on the notice or order, and all periods within which an appeal may be filed apply from and after that date."
Unless the mailing is returned because of an undeliverable address, the mailing of that information is prima-facie evidence that delivery of the notice or order was completed ten days after the commissioner sent the notice or order by ordinary mail and that the notice or order was served.
If the ordinary mail is subsequently returned because of an undeliverable address, the commissioner shall proceed under division (B)(1)(a) of this section. A person may challenge the presumption of delivery and service under this division in accordance with division (C) of this section.
R.C. § 5703.37