Free Download Mailster Newsletter WordPress Plugin – Mailster is one of the popular newsletter plugins for WordPress that lets you do all email marketing related stuff right from your WordPress dashboard. This plugin allows you to create attractive opt-in forms to collect your visitor’s email addresses. You can even create Double-Opt-in forms. It also works with third-party plugins like Gravity Forms, Ninja Popups, re Captcha, Convert Plug, and many others. You can design your subscriber box with any other plugin and then connect it with Mailster to manage your subscribers.