How to send mail via telnet to a server using SMTP commands

Sending an e-mail via Telnet 
 In this document, we: 
 
 shall use Telnet to connect to the SMTP server. 
 shall give commands to the server, then type our e-mail, and finally
tell the server, 'Okay, the e-mail is done. Send it. 
 can then send more mails, or disconnect from the server. 
 
 Connect 
 telnet mail.monitortools.com 25 
 This will open a Telnet window, and within a short time, you will be
connected to the SMTP server, and the server says: 
 220 PROTAGONISTNT Mailmax version 4. 8. 3. 0 ESMTP Mail Server Ready 
 This varies, but you should definitely see the '220' part. It is an
indication that the server is ready to service your request. 
 Handshake 
 Now the server expects you to identify yourself. You can enter the
name of your computer or anything else you want. If you have a
domain-name, then you should enter the domain-name here. My computer's
name is dell01, so I say: 
 helo dell01 
 Note that it is 'helo' and not 'hello'. The commands are not
case-sensitive, so you can also say HeLo or HELO or hELo. The server
replies: 
 250 HELO 217.120.215.201, How can I help you? 
 This is like a shake-hand. You tell the server your name, and it says
its name! Computers are quite friendly, you see! 
 From 
 Next give the server your e-mail address. Note that most SMTP
servers require that your e-mail address belong to the same domain as
the server. For example, if you send mail from Yahoo! SMTP
server, you should have a Yahoo! address. You cannot use it if you give
it a Hotmail address. Let me give the SMTP server some e-mail
address: 
 mail from: webmaster@monitortools.com 
 'mail from:' is a SMTP command. Note that there is a space between
'mail' and 'from', followed by a colon (:). The server says: 
 250 Ok 
 To 
 Tell the server who you want to send the e-mail to. Let me send a
mail to info@activexperts: 
 rcpt to: info@activexperts.com 
 There are no restrictions here. You can enter any e-mail address. If
there is some problem with the recipient-address, your mail will bounce,
but for now, the server doesn't complain. It will say: 
 250 Ok 
 Body 
 You have told the server your e-mail address, and the recipient's
e-mail address, so now you can go ahead and type the e-mail. You have to
do that with the data command: 
 data 
 The server asks you to go ahead with your e-mail: 
 354 End data with . 
 Send 
 Now type in your e-mail, like this: 
 This is a test e-mail. 
 Remember to type it all right. Backspace key doesn't work in Windows 
 Telnet, though it does in Linux. If you make a mistake, try pressing 
 CTRL-h. If it works, well and good. 
 When you finish your e-mail, press [ENTER], then a '.', and again an
[ENTER]. This tells the server that you have finished the e-mail, and it
can send it. It will say: 
 250 Ok: queued as 6AB5150038 
 Your mail was sent! 
 Disconnect 
 Now you can either send another mail, or disconnect from the server.
If you want to send another mail, you should repeat the 'rcpt to:' and
'data' commands. There is no need for 'helo' and 'mail from:', because
the server already knows who you are. If you want to disconnect, just
say 'quit': 
 quit 
 The server will reply: 
 221 Bye 
 and you will lose connection with the server.