I tried to implement a single email field on my saas website for free trial signups. But I got bombarded by spam. Using google invisible recaptcha make the user experience very bad. Is there are any other work around? Given the spam rate I decided to remove it for now. But I am curios about how basecamp is doing it. I have seen it on other websites as well but some of them do no post the data anywhere. They just capture the email and auto fill it in the final form. But basecamp is using the email to create a trial account right away. Any help?