Outlook 2010 - creating a macro

Public Sub GetCurrentEmailInfo()
    Dim Session As Outlook.Namespace
    Dim currentExplorer As Explorer
    Dim Selection As Selection
    Dim currentItem As Object
    Dim currentMail As MailItem
   
    Set currentExplorer = Application.ActiveExplorer
    Set Selection = currentExplorer.Selection
    
    'for all items do...
    For Each currentItem In Selection
        If currentItem.Class = olMail Then
            Set currentMail = currentItem
            IP_Address = GetIPAddresses(GetInetHeaders(currentMail))
            MsgBox currentMail.Sender & "/" & IP_Address, vbOKOnly
        End If
    Next

    
End Sub





Private Function GetInetHeaders(olkMsg As Outlook.MailItem) As String
' Purpose: Returns the internet headers of a message.'
  Const PR_TRANSPORT_MESSAGE_HEADERS = "http://schemas.microsoft.com/mapi/proptag/0x007D001E"
  Dim olkPA As Outlook.PropertyAccessor
  Set olkPA = olkMsg.PropertyAccessor
  GetInetHeaders = olkPA.GetProperty(PR_TRANSPORT_MESSAGE_HEADERS)
  Set olkPA = Nothing
End Function

Private Function GetIPAddresses(ByVal MsgHeader As String) As String()
 Dim tempArr() As String, i As Long, RegEx As Object, RegC As Object
 Set RegEx = CreateObject("vbscript.regexp")
 ReDim tempArr(0)
 With RegEx
  .Global = True
  .MultiLine = True
  .Pattern = "\[?(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})\]?"
 End With
 If RegEx.Test(MsgHeader) Then
  Set RegC = RegEx.Execute(MsgHeader)
  ReDim tempArr(RegC.Count - 1)
  For i = 0 To RegC.Count - 1
   tempArr(i) = RegC.Item(i).SubMatches(0)
  Next
 End If
 Set RegEx = Nothing
 Set RegC = Nothing
 GetIPAddresses = tempArr
End Function

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