How to test SMTP operations using Telnet

1. Telnet into Exchange server hosting IMS service using TCP port 25. Command is telnet <servername> 25 2. Turn on local echo on your telnet client so that you can see what you are typing. On Win 9x and NT 3.5/4.0 Telnet client this done by selecting the “preferences” from the “terminal” pull down menu, and checking the local echo radio button.  For Windows 2000 telnet client, issue command “set local_echo”, from the telnet command prompt. 3. Issue the following smtp command sequence helo <your domain name><enter>                   response should be as follows 250 OK mail from: <your Email Address><enter> response…