Prompt for password when sending - vba

Question

I want Outlook to prompt for a password or some sort of authentication on all outgoing mail items, because someone keeps sending on behalf on my account.
I have written:
If Omail.SendUsingAccount = "My Domain Email account typed here" Then
Sub password()
Dim pass As String
pass = InputBox("Enter Password")
If pass <> "thepassword" Then Exit Sub
End Sub
This doesn't work. After I have the correct code can I then just insert that into a custom action rule?

Answer 1

Please use the below code:
Private Sub Application_ItemSend(ByVal Item As Object, Cancel As Boolean)
prompt$ = "Enter Password to Send Mail"
Dim pass As String
pass = InputBox("Enter Password")
If pass <> "yourpwd" Then
Cancel = True
End If
End Sub
Its tested and its working fine.
make sure you have enabled macro from trust centre.

Answer 2

You can develop a VBA macro where you can handle the ItemSend event of the Application class which is fired whenever an Microsoft Outlook item is sent, either by the user through an Inspector (before the inspector is closed, but after the user clicks the Send button) or when the Send method for an Outlook item, such as MailItem, is used in a program.
For example:
Public WithEvents myOlApp As Outlook.Application
Public Sub Initialize_handler()
Set myOlApp = Outlook.Application
End Sub
Private Sub myOlApp_ItemSend(ByVal Item As Object, Cancel As Boolean)
Dim prompt As String
prompt = "Are you sure you want to send " & Item.Subject & "?"
If MsgBox(prompt, vbYesNo + vbQuestion, "Sample") = vbNo Then
Cancel = True
End If
End Sub
You may find the Getting Started with VBA in Outlook 2010 article helpful.