You need a script in conjunction with a rule that identifies the incoming messages e.g. as follows. Use the test macro with an existing message to test the script.
Code:
Option Explicit
Sub TestScrubbed()
Dim olMsg As MailItem
On Error Resume Next
Select Case Outlook.Application.ActiveWindow.Class
Case olInspector
Set olMsg = ActiveInspector.currentItem
Case olExplorer
Set olMsg = Application.ActiveExplorer.Selection.Item(1)
End Select
CheckScrubbed olMsg
lbl_Exit:
Exit Sub
End Sub
Sub CheckScrubbed(olItem As MailItem)
'Graham Mayor - https://www.gmayor.com - Last updated - 03 Feb 2021
Const strFind As String = "Total Scrubbed Deferred: "
Dim olInsp As Inspector
Dim wdDoc As Object
Dim oRng As Object
Dim sText As String
Dim sMsg As String
Dim i As Integer
Dim oCol As Collection
With olItem
Set oCol = New Collection
Set olInsp = .GetInspector
Set wdDoc = olInsp.WordEditor
Set oRng = wdDoc.Range
With oRng.Find
Do While .Execute(findText:=strFind & "[0-9]{1,}", MatchWildcards:=True)
sText = Replace(oRng.Text, strFind, "")
Select Case True
Case CInt(sText) = 0
olItem.UnRead = False
Case CInt(sText) > 0
On Error Resume Next
oCol.Add oRng.Text, oRng.Text
End Select
.collapse 0
Loop
If oCol.Count > 0 Then
olItem.UnRead = True
For i = 1 To oCol.Count
If i = 1 Then sMsg = oCol(i)
If i > 1 Then sMsg = sMsg & vbCr & oCol(i)
Next i
MsgBox sMsg, vbExclamation
End If
End With
End With
lbl_Exit:
Set olInsp = Nothing
Set wdDoc = Nothing
Set oRng = Nothing
Exit Sub
End Sub