Double Opt-In for Download (DOIFD) is a freemium Wordpress plugin that you can embed in your Wordpress website or blog. Designed to help marketers build a highly interested audience through free downloads (newsletters, ebooks, white papers), DOIFD provides a simple one-click verification link in a welcome email. Once verified, the link returns the subscriber to your website to retrieve your download content. The lightweight plugin helps organizations of all kinds to build and maximize a customer base.