Can constant contact forms force double opt in?

We’re getting hundreds of spam entries, and even if we didn’t, we need to to double opt in so no one subscribes someone else to a constant contact list.

I cannot find anywhere that the gravityforms feed will send a user an email to confirm their optin

Is it possible to get that feature?

Constant Contact API doesn’t provide a way to handle Double Opt-in. You need to configure it in your Constant Contact account settings: