Today, many people use several e-mail accounts for communication due to the popularity of free accounts that you can set up anytime. In Microsoft Outlook 2007/2010 you can choose the account which you want to send the message from (Fig. 1.). 

Fig. 1. Manual account select prior to sending a message.

Unfortunately, sometimes we accidently send a message from a different account that we initially wanted to. We can prevent that from happening by setting a proper rule that will delay sending the message and will ask for an account to send from. 

Below, there is an example of an alternative way of choosing an account before sending the message. 

 
Fig. 2. An alternative window that asks for an account before sending a message.

If the user will provide an incorrect number in the window (Fig. 2.) the message will not be sent and an appropriate error window will be displayed. 

Put the following code in the "ThisOutlookSession" class in the Visual Basic macro editor:

Private Sub Application_ItemSend(ByVal Item As Object, Cancel As Boolean)
'MVP Shon Oskar - VBATools.pl
    If Item.Class = 43 Then
        Dim objMailItem As MailItem, ChangeMail As MailItem
        Dim olNS As Outlook.Namespace
        SET olNS = Application.GetNamespace("MAPI")
        Dim choose$, list$, x&

        For x = 1 To olNS.Accounts.Count
            list = list & x & " -" & olNS.Accounts.Item(x).DisplayName & vbCr
        Next x
        choose = InputBox("Choose your account number from the list:" & vbCr & list, _
        "Sending from a selected account VBATools.pl", 1)
        
        If Len(choose) = 0 Then Cancel = True
            If IsNumeric(choose) = True Then
                If choose > x Then GoTo error
                Set objMailItem = Item
                With objMailItem
                Set ChangeMail = .Copy
                    .Delete
                    Cancel = True
                End With
                With ChangeMail
                    .SendUsingAccount = olNS.Accounts.Item(choose)
                    .Save
                    .Send
                End With
            Else
error:
                Cancel = True
                MsgBox "You didn't choose proper account number", vbExclamation, _
                "Sending from a selected account VBATools.pl"
            End If
        Set ChangeMail = Nothing
        Set objMailItem = Nothing
        Set olNS = Nothing
    End If
End Sub

After you save the above procedure it may be necessary to restart MS Outlook.

If you are not experienced in macro installation, please refer to this article

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 (c) Shon Oskar 
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