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In the same way Microsoft Outlook will pop up an alert if you try to send an email with the To field left blank, or try to send a calendar invite with the Location field blank, I want an alert that comes up if I have left the Bcc field blank. Any ideas on how this can be achieved?

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This could be done with an Outlook add-on. You might even be able to do a VBA script that checks for it. – Ramhound Jul 18 '13 at 16:54

put this vba in your thisoutlooksession module and adjust your macro settings accordingly

Public WithEvents myOlApp As Outlook.Application

Public Sub Initialize_handler()
    Set myOlApp = CreateObject("Outlook.Application")

End Sub

Private Sub myOlApp_ItemSend(ByVal Item As Object, Cancel As Boolean)

Dim prompt As String
prompt = "The BCC Field is empty!"

If Item.BCC = "" Then

    If msgbox(prompt, vbYesNo + vbQuestion, "BCC Field") = vbNo Then
    Cancel = True
    End If
 End If

End Sub
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