For Example, if we want to sent email to suroboy.com, frist, we must know about MX for this domain :
# host -t mx suroboy.com
suroboy.com mail is handled by 0 suroboy.com.
# telnet suroboy.com 25
Trying 72.233.78.218…
Connected to suroboy.com.
Escape character is ‘^]’.
220-usa2.neoserver.net ESMTP Exim 4.69 #1 Fri, 04 Sep 2009 08:37:58 +0700
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
And then named of the sender :
MAIL FROM: <suroboy@gmail.com>
250 2.1.0 Ok
If you don’t want to mention the sender’s name (Return-Path blank),we can write :
MAIL FROM:<>
Named of the receiver :
RCPT TO: <suroboy@suroboy.com>
250 2.1.5 Ok
This RCPT line can be repeated by the others ( if there’s any receiver ), for example we want to send this email for three people in the same domain :
RCPT TO: <user1@suroboy.com>
RCPT TO: <user2@suroboy.com>
…
Note: If the domain were different, we have to call that different MX domain.
Then sent that body of email , and ended with a line contain with dot(.) :
DATA
354 End data with <CR><LF>.<CR><LF>
Subject: Test
this is only a test, please pay attentioned 
.
250 2.0.0 Ok: queued as 6762913F6F7
For Exit:
QUIT
221 2.0.0 Bye
Connection closed by foreign host.
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