Signing Requirements
Postnuptial agreements are a type of contract and are generally subject to basic contract principles, so the best practice is for the agreement to be in writing and signed by both parties.[1]
Laws
Scrutiny: Parties to postnuptial agreements are held to the highest degree of good faith, honesty, and candor in connection with the negotiation and execution of such agreements.
Consideration: Because a postnuptial agreement is subject to contract principles, it must be supported by adequate care.