§ 26 O.S. § 26-14-147Counting of ballots

A. A valid military-overseas ballot cast in accordance with
Section 10 of this act must be counted if it is delivered by 7:00
p.m. the day of the election to the address that the appropriate
state or local election office has specified.
B. If, at the time of completing a military-overseas ballot and
balloting materials, the voter has declared under penalty of perjury
that the ballot was timely submitted, the ballot may not be rejected
on the basis that it has a late postmark, an unreadable postmark, or
no postmark.