How to send email using telnet

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  1. Open your terminal.
  2. Now, connect with telnet using the following command: 
    telnet smtp.domain.com 25
  3. Type ehlo example.com. Some servers also accept helo in place of ehlo. 
    ehlo
  4. Type mail from: username@example.com: 
    mail from: username@domain.com
  5. Type rcpt to: user@hotmail.com, user2@yahoo.com (replace with your actual recipient name): 
    rcpt to: user@hotmail.com, user@yahoo.com
  6. To write the message – type data, followed by your subject and message. To end the message, put a period on a line by itself and press enter: 
    data
Subject: My Telnet Test Email
Hello,
This is an email sent by using the telnet command.
Your friend,
Me
.
  7. Type quit to exit telnet.