Michigan Compiled Laws, Chapter 445. Trade and Commerce § 445.2507

Sec. 7. (1) Except as otherwise provided under subsection (2), a person who violates this act is guilty of a misdemeanor punishable by imprisonment for not more than 1 year or a fine of not more than $10,000.00, or both.

(2) A person who violates section 4  1 or violates this act in the furtherance of another crime is guilty of a felony punishable by imprisonment for not more than 4 years or a fine of not more than $25,000.00, or both.

(3) Each commercial e-mail sent in violation of this act is a separate violation under this section.

(4) An e-mail service provider does not violate this act as a result of either of the following:

(5) It is prima facie evidence that the sender is in violation of this section if the recipient is unable to contact the sender through the return e-mail address provided by the sender under section 3.  2

(6) It is a defense to a case brought under this section or an action under section 8  3 that the unsolicited commercial e-mail was transmitted accidentally or as a result of a preexisting business relationship. The burden of proving that the commercial e-mail was transmitted accidentally or as a result of a preexisting business relationship is on the sender.