This procedure will test connectivity and sending ability with your local Exchange server using telnet on port 25
Open a command prompt and enter telnet <servername> <port>
In this case we are using port 25 (SMTP).
Next we need to initiate the connection using EHLO to identify the server. We will enter: EHLO newmoon.microsoft.net
Enter the sender email address as MAIL FROM: sample@microsoft.net
the reply should be Sender OK
Next we will enter the Recipient email address as RCPT TO: jreilly@reillytele.com
the response should be Recipient OK
Now we will enter the the word DATA
and hit enter.
Enter the email subject line as Subject: test message
and hit the 'Enter' key twice
Now enter the body of the message.
To complete the email and send it enter "." on a line by itself
You should receive a Queued mail for delivery message. To quit enter QUIT