Spoofing emails, via telenet

get a smtp server ( i use mx1.hotmail.com) theyre normally like
mx1,mx2 etc..thehost.com.

Now, go to Start>Run>cmd
then in the cmd window, type
telnet mx1.hotmail.com 25
then
HELO hotmail.com
then
MAIL FROM : (fakeemailhere)
then
RCPT TO: (person)
then
DATA
then type your message, you can press enter for a new line, finish the message by a full stop (.) on a new line, press enter!

spoofed.