Mail

flowchart LR
  Mail["BP_Prog_Mail<br/>OnSettingsLoad"]
  Data["BP_Prog_MailData<br/>authorized user"]
  Settings["BP_Prog_MailSettings<br/>saved user"]
  Mail --> Data & Settings

screenshot

Blueprint for the mail bundled within the plugin can be accessed from Plugins/OperatingSystemSimulator/Content/OperatingSystemContent/Shared/Blueprints/Programs/Mail/BP_Prog_Mail. Alongside the Blueprint, you can access mail program data and settings.

bp classes

Implementation for all of these Blueprints are very minimal. See below for a quick introduction as to how these classes are used.

BP_Prog_Mail - Defines all the defaults and implements OnSettingsLoad to set the authorized user on BP_Prog_MailData.
BP_Prog_MailData - Nothing implemented. Only used as a way to read/write variables.
BP_Prog_MailSettings - Saves the already authorized user.

All the actual implementation are done in UMG classes which can be accessed from Plugins/OperatingSystemSimulator/Content/OperatingSystemContent/Shared/Blueprints/Widgets/Programs/Mail folder.