For secure email
With the regify client for windows you can create, open and read regify messages. It includes an Add-In for Microsoft Outlook (version 2013 and higher). This setup is also needed for Lotus Notes. It is compatible with Windows 8.1 or newer.
Download regify Client for Mac
Info about regify Client for Linux deb
Download regify Client for Android
Download regify Client for Ios
Download regify Client for Thunderbird