see also: http://www.rdpslides.com/webresources/FAQ00035.htm
          http://www.mike-tech.com/article.php?gif=exchange55&article=94

telnet hostname 25
HELO your_domain
MAIL FROM:you@yourmail.addy
RCPT TO:someone@else.addy
DATA
type your shit here
.
QUIT

telnet hostname 110
USER username
PASS password
LIST
RETR <message number>
QUIT