Ga. Comp. R. & Regs. 183-1-14-.10
Absentee ballots cast in a primary, election, or runoff by eligible electors who reside outside the county or municipality in which the primary, election, or runoff is held are members of the armed forces of the United States, members of the merchant marine of the United States, spouses or dependents of members of the armed forces or merchant marine residing with or accompanying such member, or overseas citizens that are received by United States Mail or commercial courier, without bearing a postmark, and within the three-day period following such primary, election, or runoff, if proper in all other respects, shall be valid ballots and shall be counted and included in the certified election results.
GA Regs. 183-1-14-.10
O.C.G.A. Secs. 21-2-31, 21-2-386.