Steps

1. Open the cmd prompt.
2. Type telnet server.com 25 (where "server.com" is the name of the smtp (outgoing) server of your email provider, such as smtp-server.austin.rr.com). This can be found by checking your account info in the program you normally use for email.
3. Type HELO server.com.
4. Type MAIL FROM: you@server.com.
5. You may get a message saying "250 ok"
6. Type RCPT TO: Friend1@anotherserver.com, friend_two@someotherserver.org, friend.3three@Someserver.com, etc.
7. again, You may get a message saying "250 ok"
8. To write the message, type DATA, followed by your message.
9. To end the message, put a period on a line by itself and press Enter.

Tips

• Just a note: you may have to enter a ":" after the "mail from:" and the "rcpt to:"
• This can also be used to send email as other people.
• Some servers also accept 'ELHO' in place of 'HELO'.