Validating before sending form.

Good afternoon, I wanted to check, if there is any way before sending a form, to preview another email or text message, example: validating the data.

Hi, I am not exactly sure what you are looking for. If you need to password protect the form, please follow this guide: https://www.jotform.com/help/579-How-to-Password-Protect-a-Form

If that is not what you mean, could you please explain further?

If you need the user to validate his email address before submitting the form, please use the E-mail Validator widget: https://widgets.jotform.com/widget/e-mail_validator