I am trying to publish my Exchange 5.5 sp4 NT 4 server through ISA server sp 1a. I followed MS article 311237 method 1 "How to Publish an Exchange Server 5.5 behind ISA server" without success. I then followed the procedure in the "ISA Server and Beyond" book without success either. My test mail sat in the Exchange out going queue. I did have an error message on ISA about the server publishing rule mapping the internal IP to the external IP on port 25 failing. This message resolved when I disabled the SMTP service on ISA. But still no incoming or outgoing mail. Where should I look next or what did I do wrong? Todd Lemmiksoo Network Administrator All-Mode Communications, Inc. 1725 Dryden Road Freeville, New York 13068 (607) 347-4164 x440 1-877-ALLMODE (toll free) http://www.all-mode.com