Okla. Stat. tit. 26, § 26-14-147: Counting 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.