Minn. Stat. § 351.01
Subd. 1. To whom made.
Resignations shall be made in writing signed by the resigning officer:
Subd. 2. When effective.
Except as provided by subdivision 3 or other express provision of law or charter to the contrary, a resignation is effective when it is received by the officer, body, or board authorized to receive it. In the case of a position appointed by the governor under section 15.0597, the resignation must be submitted to the governor.
Subd. 3. Contingent resignations prohibited; exception.
Subd. 4. Withdrawal of resignation.
A prospective resignation permitted by subdivision 3 may only be withdrawn by a written statement signed by the officer and submitted in the same manner as the resignation, and may only be withdrawn before it has been accepted by resolution of the body or board or before a written acceptance of the resignation by an officer authorized to receive it.