I have a product idea and very rough prototype I want to take to a local 3D print/prototyping company to have a higher fidelity version made. I would of course not want them to make the 3D model available publicly or otherwise print/sell my idea or product. However, the product idea is very small/simple and in my eyes not yet worth pursuing a lawyer and fees to have an NDA or patent written up. In previous talks with this company they too prefer avoiding NDAs as they then have to consult their lawyers to insure it doesn't accidentally block them from working on other projects, etc. They did however assure me confidentiality over an email stating that anything we discuss will be a professional service and kept between us.
I read here: https://www.lawgives.com/guide/551c797e777777655d8e0000/What-Do-You-Mean-We-Have-A-Contract-How-to-Prevent-an-Email-Exchange-From-Inadvertently-Becoming-a-Binding-Contract that emails could constitute a legally binding contract. Would that promise of confidentiality be enforceable if they did leak my idea or product?