Thanks guys, I'm doing everything on one machine. I undid the SMTP configuration, I deleted 127.0.0.1 and left the list empty, and I chose "All except the list below" for both "Connection" and "Relay". I restarted SMTP server, then I tried my code, still didn't work. After that I tried, "telnet localhost 25", and it responded correctly; then "helo" it returned "hello". However, I tried "mail from:" and "mail from:" all these returned "501 5.5.4 Invalid Address", so exactly what is my email address or what is the correct address to type in for this test? And, in general how is an email address formed or given? Thanks! Ray.