To prevent abuse Formspree treats each combination of URL and email address as a different form. Each different form must be confirmed individually. So if you have your form appearing on https://your-site.com/contact and https://your-site.com/about, these are different forms and must be confirmed separately. The same if you have https://www.your-site.com/contact (note the extra `www` - that's a different URL so it looks like a separate form to us).
For Gold users, things work differently. In the dashboard, when you create a form, it's given a unique ID. The form's endpoint uses the ID instead of your email. We call these "private email" forms. When we receive a submission to that endpoint with its unique ID, we can look up the form directly, rather than referencing the referring URL. That means we can treat it as one form regardless of what page it's on.
To see all the features available on the Gold plan, please check out our Plans page.