Mississippi Code Title 79. Corporations, Associations, and Partnerships § 79-11-243

(1) A director may resign at any time by delivering written notice to the board of directors, its presiding officer or to the president or secretary.

(2) A resignation is effective when the notice is effective unless the notice specifies a later effective date. If a resignation is made effective at a later date, the board may fill the pending vacancy before the effective date if the board provides that the successor does not take office until the effective date.