Mich. Comp. Laws § 450.3144: Proxies; voting by mail ballot, referendum, or electronic transmission.

Sec. 1144.

(1) Notwithstanding section 421, there shall be no proxies unless the articles of incorporation or bylaws authorize use of proxies. If the articles of incorporation or bylaws authorize use of proxies, an individual may not vote more than 5 proxies at any meeting.

(2) The articles or bylaws may provide a method by which members may vote on matters submitted to a vote of members by mail ballot, referendum, or electronic transmission.