Sending secured message via SS site

Hi there

I'm working on a website and need to find out if you can do "secure mail/secure message" via Squarespace?

It is a lifestyle consultant who would like customers to be able to send the person in question a message via the page - more personal things can be written in.

The company has a decidedly secure e-mail - where tunnel-encrypted messages can be sent from another secure e-mail. But I don't think that is the solution. The solution is more of a box model on the page.

Anyone have examples of sites in operation that have such a solution?

Best regards
Morten