vb.net : send an email with sensitivity label

Question

i have an application at work which creates a new html mail message,trough the outlook client on my pc. the security policy wants me to set sensibility label each mail. i tried with this code but it doesn't work,cause the new mail message comes up without the sensitivity label.is there anybody can help me ? i don't have access do admin configuration/powershell or whatever.. thanks

Try
Dim Outlook_App As New Microsoft.Office.Interop.Outlook.Application
Dim Outlook_Message As Microsoft.Office.Interop.Outlook.MailItem




            Outlook_Message = Outlook_App.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olMailItem)
            Outlook_Message.Sensitivity = Microsoft.Office.Interop.Outlook.OlSensitivity.olConfidential

            Outlook_Message.BodyFormat = Microsoft.Office.Interop.Outlook.OlBodyFormat.olFormatHTML
            Outlook_Message.Subject = "Orientamento treno " & numerotreno & " del " & Today.ToShortDateString
            Outlook_Message.HTMLBody = emailTemplate



            Outlook_Message.To = "[email protected]"
            'con questa procedeura faccio inviare la mail dall'account che corrisponde a quest'indirizzo

            Dim account As Microsoft.Office.Interop.Outlook.Account

            For Each account In Outlook_App.Session.Accounts
                If account.DisplayName = "[email protected]" Then

                    Outlook_Message.SendUsingAccount = account
                    Outlook_Message.Sensitivity = Microsoft.Office.Interop.Outlook.OlSensitivity.olConfidential
                End If
            Next

            Outlook_Message.Display(False)

Answer 1

The MailItem.Sensitivity property returns or sets a constant in the OlSensitivity enumeration indicating the sensitivity for the Outlook item. That is a pure Outlook label and not related to Sensitivity labels and Azure Information Protection.

You need to add a user property in the following format:

"MSIP_Label_" & guid_internal_use_only & "_Enabled"

Look for the UserProperties.Add method for such tasks.

But I'd suggest exploring internals of Outlook mail items using MFCMAPI or OutlookSpy to find the exact solution. Try to set it manually then explore internals using these tools.