What is showing in the FW or IP logs on the ISA? It sounds like the Exch server is not a secureNAT client if you have to have the FW client installed and enabled to connect through the ISA. Check this out... http://www.isaserver.org/shinder/tutorials/secure_nat_client.htm http://www.isaserver.org/shinder/tutorials/publishing_a_mail_Server_with_isa_server.htm Jim Harrison MCP(2K), A+, Network+, PCG ----- Original Message ----- From: Paul Gee To: [ISAserver.org Discussion List] Sent: Tuesday, August 28, 2001 4:42 PM Subject: [isalist] Exchange 2000 behind ISA - SMTP oubound blocked ... http://www.ISAserver.org I have an Exchange 2000 box sat behind my ISA server. It can receive mail ok but I cannot get it to send. (Cannot connect to external smart host) I have followed the new SMTP tutorial but am getting no joy ! Basically I am trying to test by telneting to port 25 on my ISP's smart host. I can resolve the smart hosts name FQDN via DNS ok, but the telnet connection fails. I can telnet ok from behind the ISA server on a machine with the firewall client installed, and it works ok on the ISA server itself. I created a outbound SMTP protocol rule, and one for DNS, both apply to any request. I have disabled the SMTP service on the ISA server. II have published the Mail server. According to the tutorial, that should be it. It still don't work and I don't know what to do ! Regards Paul Gee ------------------------------------------------------ You are currently subscribed to this ISAserver.org Discussion List as: jim@xxxxxxxxxxxx To unsubscribe send a blank email to $subst('Email.Unsub')