question

You can handle the NewMailEx event of the Application class in Outlook. The event is fired when a new message arrives in the Inbox and before client rule processing occurs. It fires once for every received item that is processed by Microsoft Outlook. The item can be one of several different item types, for example, MailItem, MeetingItem, or SharingItem. The EntryIDsCollection string contains the Entry ID that corresponds to that item. Call the NameSpace.GetItemFromID method and process the item.

In the NewMailEx event handler you may check all your conditions and forward the incoming email if required. The MailItem.Forward method executes the Forward action for an item and returns the resulting copy as a MailItem object. The following VBA sample code shows how to forward mail items:

 Sub RemoveAttachmentBeforeForwarding()
  Dim myinspector As Outlook.Inspector 
  Dim myItem As Outlook.MailItem 
  Dim myattachments As Outlook.Attachments
     
  Set myinspector = Application.ActiveInspector

  If Not TypeName(myinspector) = "Nothing" Then 
    Set myItem = myinspector.CurrentItem.Forward 
    Set myattachments = myItem.Attachments 
    While myattachments.Count > 0 
      myattachments.Remove 1 
    Wend 
    myItem.Display 
    myItem.Recipients.Add "Eugene Astafiev" 
    myItem.Send 
  Else 
    MsgBox "There is no active inspector." 
  End If 
 End Sub

Do you know any third party software can do the job?
The script doesn't seem to meet the condition that I want. If just forwarding, I can just use the rule on the outlook.