Hi, I have a network setup like the following design: INTERNET | ISA BOX | | | | | ---------------- WEB SERVER | ---------------- MAIL SERVER | LAN It is a tri-homed ISA setup. I have a web site that uses CDONTS to send messages through SMTP. The thing is that messages don't leave the \Queue folder. Any suggestions? TIA, Vasilis I. P.S. I test it on a web server that is not behind a firewall and it works fine. Any help greatly appreciated.