Using the Code

We'll follow these steps to validate an empty subject line for Outlook 2007.
Go to Tools -> Macro -> Visual Basic Editor. Or, directly press Alt + F11.


The Visual Basic editor window gets opened.
On the left pane, you will see Microsoft Outlook Objects or Project1, expand this. Now, you will see the ThisOutLookSession entry.


Double click on ThisOutLookSession. It will open up a code pane.
Copy and paste the following code in the code pane:
Collapse | Copy Code
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



Now, just save the project.

There is one more setting you need to do, and that is to enable the macro. Go to Tools->Macro->Security. A dialog window gets opened. Select Warning for all macro options.



That's it.. You are good to go now.

Close your Outlook and open it again. You will be notified about a security concern. See the image below:



Click on Enable Macros.

Now, try to send an mail with an empty subject line. Enjoy....