Prevent Outlook from Sending Emails with a Blank Subject

In the IT Industry, Outlook is most popularly used as the Email client. The subject line is a very important part of any email. Many times has it happened to you that you have sent an email through Outlook without a subject line? After clicking the Send button, you realize that you have made a mistake (What if it is a case you have sent a mail without Subject to a Client or a Manager?)
By default, Outlook does not validate a mail with a blank subject and here is the solution.
1. Open MS Outlook -> Tools -> Macro -> Visual Basic Editor
2. You will see Visual Basic Editor will be opened 
 3. Click ThisOutlookSession which will open the Code Editor paste the below code in the Editor -> Save it and Close the window.
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 EMail?"
      If MsgBox(Prompt$, vbYesNo + vbQuestion + _
            vbMsgBoxSetForeground, _
            "Email Subject is Empty") = vbNo Then
        Cancel = True
      End If
  End If
End Sub
4. Now, restart the outlook. You will be prompted with a window where in Click on Enable Macros.
5. Now try sending an email without subject, you will be prompted for entering a Subject in the Email.