Mich. Comp. Laws § 445.2505: Selling, giving, or distributing software; restrictions.

Sec. 5.

A person shall not knowingly sell, give, or otherwise distribute or possess with the intent to sell, give, or distribute software that does any of the following:

Is primarily designed or produced for the purpose of facilitating or enabling the falsification of commercial e-mail transmission information or other routing information.

Has only limited commercially significant purpose or use other than to facilitate or enable the falsification of commercial e-mail transmission information or other routing information.

Is marketed by that person or another acting in concert with that person with that person's knowledge for use in facilitating or enabling the falsification of commercial e-mail transmission information or other routing information.