Warn before sending emails outside the company in Outlook

Recently, I accidentally sent an internal email to a client (fortunately, a forgiving one!).

Since then, I’ve decided to look at ways of avoiding this. It turns out, you can do it with a macro.

I found this one on Slipstick Systems’ website:

Private Sub Application_ItemSend(ByVal Item As Object, Cancel As Boolean)
 Dim recips As Outlook.Recipients
 Dim recip As Outlook.Recipient
 Dim pa As Outlook.PropertyAccessor
 Dim prompt As String
 Dim strMsg As String
 Dim Address As String
 Dim lLen
 
Const PR_SMTP_ADDRESS As String = "http://schemas.microsoft.com/mapi/proptag/0x39FE001E"
 
Set recips = Item.Recipients
 For Each recip In recips
 Set pa = recip.PropertyAccessor
  
 Address = LCase(pa.GetProperty(PR_SMTP_ADDRESS))
 lLen = Len(Address) - InStrRev(Address, "@")
 
 Select Case Right(Address, lLen)
    Case "cdolive.com", "slipstick.com", "outlookmvp.com"     
          
    Case Else ' remove case else line to be warned when sending to the addresses
     strMsg = strMsg & " " & Address & vbNewLine
 End Select
 Next
 
If strMsg  "" Then
 prompt = "This email will be sent outside of the company to:" & vbNewLine & strMsg & vbNewLine & "Please check recipient address." & vbNewLine & vbNewLine & "Do you still wish to send?"
 If MsgBox(prompt, vbYesNo + vbExclamation + vbMsgBoxSetForeground, "Check Address") = vbNo Then
 Cancel = True
 End If
 End If
 
End Sub

Simply list your company’s email domains, and the marco will warn you if you send a message outside of those!

They also provide a tutorial video of how to install the macro.

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