I get the following error when trying to send mail from a server recently published in ISA2k4: This is an automatically generated Delivery Status Notification. THIS IS A WARNING MESSAGE ONLY. YOU DO NOT NEED TO RESEND YOUR MESSAGE. Delivery to the following recipients has been delayed. marvinc@xxxxxxxxx I don't get any responses when trying to send to this server from the outside. There are no errors being generated on the exchange server and the following error was received from the Connectivity Verifier on the ISA server: The connectivity verifier "server" reported an error when trying to connect to "ip address". Reason: No connection. That was over an hour ago. I've since then rebooted and the error hasn't returned. I've forwarded port 25 on the router but I still see messages sitting in the que. I have a policy rule in place to allow DNS and SMTP on the mail server and SMTP server on the external listener. What else could I be missing? The domain in question is mail.nusolutions.biz and I'm hosting the mail server internally using TZO. thnks