Email Spoofing : How to spoof email address

In my post i have used mailserver.com just for example you need to use an real time mail server for yourself.
Why not try on your org email domain :)

Open Command prompt then enter the following commands.
telnet smtp.mailserver.com 25
HELO QA <PRESS ENTER>
MAIL FROM:yourid@mailserver.com   <PRESS ENTER>
RCPT TO:yourid@mailserver.com   <PRESS ENTER>
DATA   <PRESS ENTER>
Subject:test mail <PRESS ENTER TWICE>
This a test mail           (This is body text)
.                                 (This '.' is to end the mail)

If you see something like following message, then it means you have successfully spoofed the sender email.
250 2.0.0 qA28jUNa098936 Message accepted for delivery

Type QUIT to quit.