Windows 7 - How to Send Email Using Telnet

1. Open the command prompt by clicking Start menu > Run. Then type cmd and press OK.

Type telnet server.com 25 (where "server.com" is the name of the smtp (outgoing) server of your email provider, such as mail.contoso.com). 

Type HELO mail.contoso.com

Type MAIL FROM:admin@server.com

You may get a message saying "250 ok"

Type RCPT TO:Friend1@anotherserver.com, friend_two@someotherserver.org, friend.3three@Someserver.com, etc.

To write the message, type DATA and press Enter.

1. On the first line type SUBJECT:yoursubject and press Enter twice.
2. Continue typing your message.
3. Put a single period (.) on a line by itself and press Enter to send your message. The server should say 'Message accepted for delivery'. (Or it says 250 OK id=`a long id`)

Type QUIT to exit Telnet

For Example;