Legal Question in Business Law in Michigan

Yes, it can be if it sufficiently specifies the terms. I would need to review the specifics to be sure. For example, I have not heard of a contract to answer for the debt of another (a guaranty) being in the form of an email,

I agree with Mr. Morris' first sentence that the email needs to specify the terms sufficiently to create proof that there was meeting of the minds. Further, it would be necessary for performance or some kind of acknowledgement from the other contracting party. These cases tend to be close calls so attorney review of the email and supporting facts is necessary for a reliable answer.