Mississippi Code Title 23. Elections § 23-15-721

(1) Absentee ballots requested under the provisions of Section 23-15-715 for electors temporarily residing outside the county of residence shall be mailed to the elector's address outside of the county in which he or she is registered, and such electors shall appear before any official authorized to administer oaths or other official authorized to witness absentee balloting as provided in this article. The elector shall exhibit to such official his or her absentee ballot unmarked and thereupon proceed in secret to fill in the ballot. After the elector has properly marked the ballot and properly folded it, he or she shall deposit it in the envelope furnished to him or her. After the elector has sealed the envelope he or she shall deliver it to the official before whom he or she is appearing and shall subscribe and swear to the elector's certificate provided for in Section 23-15-635, which affidavit shall be printed on the back of the envelope as provided for in Section 23-15-635 containing the elector's ballot.

(2) Electors who are temporarily or permanently physically disabled shall sign the elector's certificate and the certificate of attesting witness shall be signed by any person eighteen (18) years of age or older.

(3) After the completion of the requirements of this section, the elector shall mail the envelope containing the ballot to the registrar in the county wherein the elector is qualified to vote. The ballots must be postmarked by the date of the election and received by the registrar no more than five (5) business days after the election to be counted; any received after such time shall be handled as provided in Section 23-15-647 and shall not be counted.