Notify by email if FileVault Safari-Only Guest User Logs in

Hi everyone,

I know this is an advanced topic that may not be possible, but I wanted to see if the community had any suggestions. I am familiar with the terminal, and just started learning about launchd and daemons, and sending email using the command line, so programming topics are manageable for me, but I'm not familiar with the deeper innards of the Mac OS X.

Note that this is my first post, so I wasn't sure which community to post to, but thought the developer community would be the people with the right technical know-how to provide suggestions. If this was the wrong place to post, please let me know which forum would be more appropriate.

Here is my situation: I have a FileVault-encrypted early-2015 MacBook Pro running Yosemite (10.10.5) with one user that requires administrative privileges to do work. I want to have the guest user active for the possibility of being able to track it if stolen, and I realize in that event I can use iCloud to check-in and monitor if the thief has logged into the guest account. However, I need to have a way to notify someone else if the guest user has been logged in other than iCloud, with the first thought being email.

I found this old discussion about installing Prey on a FileVault guest user account here, and saw this as a good lead on what to do, but it also seemed like I would need a bunch of other dependencies to send out an email or that doing this would require to set-up an AppleScript to do something from safari, and I'm not that familiar with using AppleScript.

Hopefully this is enough information for people to provide suggestions. Anything is welcome, and you can certainly ask questions if you need more information.

Thanks!