Forgot to mention subject in mail???

1. Open your Outlook,
2. Press Alt+F11. This opens the Visual Basic Editor and then Press Ctrl+R which in turn open Project-Project 1 (left side)
3. On the Left Pane, one can see "Microsoft Outlook Objects" or "Project1", expand this. Now one can see the "ThisOutLookSession".
4. Double click on "ThisOutLookSession". It will open up a Code Pane on the right hand side.
5. Copy and Paste the following code in the right pane (Code Pane) and save it

   Private Sub Application_ItemSend(ByVal Item As Object, Cancel As Boolean) 
       Dim strSubject As String 
       strSubject = Item.Subject 
       If Len(Trim(strSubject)) = 0 Then 
           Prompt$ = "Subject is Empty. Are you sure you want to send the Mail?" 
           If MsgBox(Prompt$, vbYesNo + vbQuestion + vbMsgBoxSetForeground, "Check for Subject") = vbNo Then 
               Cancel = True 
           End If 
       End If 
   End Sub