or maybe this one?

Public WithEvents objInboxItems As Outlook.Items

Private Sub Application_Startup()
   Set objInboxItems = Session.GetDefaultFolder(olFolderInbox).Items
End Sub

Private Sub objInboxItems_ItemAdd(ByVal Item As Object)
   Dim objMail As Outlook.MailItem
   Dim strSenderAddress As String
   Dim strSenderDomain As String
   Dim objAttachment As Attachment
   Dim strFolderPath As String
   Dim strFileName As String
   Dim strDesiredSender As String
   Dim strDesiredDomain As String
   strFolderPath = Environ("USERPROFILE") & "\Documents\"
   'strDesiredDomain = "gmail.com" <-- change to suit
   strDesiredSender = "user@gmail.com" <-- Change to suit
   If Item.Class = olMail Then
      Set objMail = Item
      'Get sender domain
      strSenderAddress = objMail.SenderEmailAddress
      strSenderDomain = Right(strSenderAddress, Len(strSenderAddress) - InStr(strSenderAddress, "@"))
      'Use either strSenderDomain or strSenderAddress Depending on Filter Desired
      'If strSenderDomain = strDesiredDomain Then
      If strSenderAddress = strDesiredSender Then
         If objMail.Attachments.Count > 0 Then
            For Each objAttachment In objMail.Attachments
                'Save in format "Subject - Attachmentname"
                'strFileName = objMail.Subject & " " & Chr(45) & " " & objAttachment.FileName
                'objAttachment.SaveAsFile strFolderPath & strFileName 
                'Save in format exactly as attachment name
                objAttachment.SaveAsFile strFolderPath & objAttachment.FileName 
                objMail.Delete 'Delete after saving attachment
            Next
         End If
      End If
   End If
EndSub