Accellion Email Plug 

Accellion Microsoft Productivity Suite Plug-ins put secure file transfer at the fingertips of business users. It enables SharePoint users to securely send any size file from within the SharePoint Document Library to both internal and external recipients across the DMZ. Using the Accellion Microsoft SharePoint Plug-in, users can securely share data with partners, vendors and other outside parties without having to build an expensive external facing SharePoint server farm.