The law always lag behind technology. This is a recent case from the Third Department Appellate Division, New York (which includes the Capital District of New York).
Summary: “Although a typed name on an email may suffice as a signature for statutes of fraud (i.e.: contracts that are required to be in writing and signed by the parties intended to be bound), the same is not true for an attachment to an email, which can easily be singed by the sender.
Here is the full decision of SolarTech Renewables, LLC v. Vitti