Mississippi Code Title 23. Elections § 23-15-677

(1) All absent voters as defined in Section 23-15-673(1) and (2) may use a duly executed federal postcard application (as provided for in the Uniformed and Overseas Citizens Absentee Voting Act, 42 USCS 1973ff et seq.) to request a ballot or to register to vote, or to do both simultaneously.

(2) An absent voter who registers to vote utilizing a federal postcard application or a Federal Write-In-Absentee Ballot may vote in an election if the voter was registered to vote ten (10) or more days prior to the date of the election.