N.C. Gen. Stat. § 163-258.12: Receipt of voted ballot.

(a) A valid military-overseas ballot cast in accordance with G.S. 163-258.10 shall be counted if it is delivered to the address that the appropriate State or local election office has specified by the end of business on the business day before the canvass conducted by the county board of elections held pursuant to G.S. 163-182.5 to determine the final official results.

(b) If the ballot is timely received, it may not be rejected on the basis that it has a late postmark, an unreadable postmark, or no postmark. (2011-182, s. 1; 2017-6, s. 3; 2018-146, s. 3.1(a), (b).)