Outlook needs to prevent sending emails without a Subject.

[Hypermog]

It's really embarassing to send an email with no subject, especially a mass
email. I don't really see the value in sending emails without a subject
anyway. So outlook should prevent it.

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http://www.microsoft.com/office/com...365151b8f&dg=microsoft.public.outlook.general

 

[Roady [MVP]]

Outlook 2010 will give you a reminder.

You can achieve this with some VBA as well;

=====START 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
===== END CODE=====

To get rid of macro security prompts, you can sign your code with SelfCert.
For instructions see;
http://www.howto-outlook.com/howto/selfcert.htm