How to make checkboxes non interactive in email

I have an app that users fill forms that have checkboxes, then email those forms as html. The problem is users can interact with the checkboxes in the email. Is there any way to make users can't do that?

I already tried with disable and read-only, but it will make the checkboxes greyed. My client didn't want it like that. BTW my client is using Outlook Web.