Hidden field??

Hi,

I would like to create an hidden field on a form so that when I receive the email containing the message, I will also read the pre-filled hidden field (e.i reminder name of the form or what page)

How can I do that? I tried with the example on the CF7 website but did not work…

[hidden your-email default:user_email “example@example.com”]

This above line will not appear on the message but I want it to appear with the message in the “”

Regards,
Marco