Personally, I would find a UNIX/Linux server with network access to all your Delphix engines, and use the CRON utility as a scheduler to periodically run a shell-script created to run the "dx_get_appliance" command from DxToolkit, then send the output to a list of email addresses using the standard UNIX/Linux "mailx" command.
You can download compiled distributions of DxToolkit for your OS platform (i.e. Windows, Mac, Linux, Solaris, AIX, etc) from HERE, or download the Perl source from the same webpage and run the Perl scripts directly. Please review the documentation page HERE for information on download and setup.
Once DxToolkit is setup locally in your network, all manner of automation (such as scripting your current request) becomes much easier.