For reports and payments transmitted through the United States Postal Service on which the post-office cancellation mark on the envelope or wrapper containing the report or payment is omitted or is not legible, the department will consider the report or fee deposited in the United States mail as five (5) postal delivery days prior to the date received by the department.
Or. Admin. Code § 740-055-0045
Stat. Auth.: ORS 184.616, 184.619 & 823.011
Stats. Implemented: ORS 818.225, 825.472 & 825.555