How to turn off or disable no subject warning in Outlook?

Author: Siluvia Last Modified: 2025-04-14

When you are using Outlook 2010 and 2013, if you send email messages without subjects, a no subject prompt box will pop up every time for reminding. If you really don’t want to fill in the subject, the no subject warning will be a big trouble for you. For helping Outlook users to get rid of the no subject warning, we provide a skill in the following tutorial.

Turn off or disable no subject warning in Outlook

Turn off or disable no subject warning in Outlook

In Outlook 2007, there is no warning if you send an email message without a subject. This function is enabled in Outlook 2010 and 2013. However, there is no feature for you to directly turn off or disable this no subject warning. In this tutorial, we will show you VBA code for achieving this.

1. Please press "Alt" + "F11" keys to open the "Microsoft Visual Basic for Applications" dialog box.

2. Expand the "Project1" > "Microsoft Outlook Objects" by double-clicking them. And then double-click the "ThisOutlookSession" to open the "VbaProject.OTM" window.

the screenshot of turning off or disable no subject warning in Outlook 1

3. Copy and paste the below VBA code into the window.

VBA: Turn off or disable no subject warning

Option Explicit
Private WithEvents oInspectors As Outlook.Inspectors

Private Sub Application_Startup()
    Set oInspectors = Outlook.Inspectors
End Sub

Private Sub oInspectors_NewInspector(ByVal Inspector As Inspector)
    Dim oItem As Object
    On Error GoTo ExitProc
    Set oItem = Inspector.CurrentItem
    If oItem.Sent = False Then
        If oItem.Subject = "" Then oItem.Subject = " "
    End If
ExitProc:
    Set oItem = Nothing
    Set Inspector = Nothing
End Sub

Private Sub Application_ItemSend(ByVal Item As Object, Cancel As Boolean)
    On Error Resume Next
    Item.Subject = Trim(Item.Subject)
End Sub

Private Sub Application_Quit()
    Set oInspectors = Nothing
End Sub

4. Click "Save" button to save the VBA code.

5. Restart the Outlook application.

Then the VBA code will take effect. When you send a message without a subject, the no subject warning box will not display anymore.

Note: Make sure that the "Enable all macros" option is checked. (Please check it by clicking "File" > "Options" > "Trust Center" > "Trust Center Settings", and in the "Trust Center" dialog, choose "Macro Settings" > "Enable all macros"), see screenshot: