A mail sorter, method, and software product are used for sorting inbound mail pieces and outbound mail pieces. The mail sorter includes sorter modules cooperatively engaged with each other, so as to receive mail pieces that are a mixture of both inbound mail pieces and outbound mail pieces, and so as to sort both the inbound mail pieces and the outbound mail pieces. The mail sorter also includes an unsorted mail piece path that is utilized by both the inbound mail pieces and the outbound mail pieces. The outbound mail pieces are mail pieces destined for sorting at a remote postal facility prior to delivery to destination addresses, whereas the inbound mail pieces are mail pieces that are not destined for sorting at a remote postal facility prior to delivery to destination addresses.