The absence of an acknowledgement letter in no way obligates the administration to reinstate a person who has previously resigned. Salt Lake City, UT 841505310.Your letter should formally acknowledge the employee's resignation, confirm their last day of employment and wish them the best. There's nothing to expedite. The letter acknowledges they've received your resignation, and legally from that point forward you are fully out. On this _____ day of ______, in the year 20__, before me,. , personally appeared.