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:
Enter the sender email address as
MAIL FROM: email@example.com the reply should be Sender OK
Next we will enter the Recipient email address as
RCPT TO: firstname.lastname@example.org 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