Iowa Code § 501A.103: Requirements for signatures on documents.

A document is signed when a person has affixed the person’s name on a document. A person authorized to do so by this chapter, the articles or bylaws, or by a resolution approved by the directors or the members must sign the document. A signature on a document may be a facsimile affixed, engraved, printed, placed, stamped with indelible ink, transmitted by facsimile or electronically, or in any other manner reproduced on the document.