Get registered emails accounts


I have an Android app that should be used for some of the company personnel only and I was thinking to prevent any one else to use the app is to get registered emails accounts in the device and compare if they are exists in online database, I need only to know how to get current registered emails accounts from any device using Firemonkey ?

This approach will work even if the employee changed his/her mobile device but I am open to other suggestions.

I use Delphi XE 8

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