Mississippi Code Title 23. Elections § 23-15-637

(1)(a) Absentee ballots and applications received by mail, except for fax or electronically transmitted ballots as otherwise provided by Section 23-15-699 for UOCAVA ballots, must be postmarked on or before the date of the election and received by the registrar no more than five (5) business days after the election; any received after such time shall be handled as provided in Section 23-15-647 and shall not be counted.

(b) All ballots cast by the absent elector appearing in person in the office of the registrar shall be cast with an absentee paper ballot and deposited into a sealed ballot box by the voter, not later than 12:00 noon, or 5:00 p.m. during the year 2020 on the Saturday immediately preceding elections held on Tuesday, the Thursday immediately preceding elections held on Saturday, or the second day immediately preceding the date of elections held on other days. At the close of business each day at the office of the registrar, the ballot box used shall be sealed and not unsealed until the beginning of the next business day, and the seal number shall be recorded with the number of ballots cast which shall be stored in a secure location in the registrar's office.