[MaximilianKohlr]

That seems off-topic. I'm not cold-emailing people. They applied on our website.

[mattl]

When they do that do you send them an email to opt-in?

[MaximilianKohlr]

I have not found a way to do that with Google Forms, so the first email I send them is telling them whether or not they passed. That email has an unsubscribe link.

[mattl]

You can require that the form requires a Google Account.