TELNET

platter:~ steve$ telnet gmail-smtp-in.l.google.com 25
Trying 74.125.155.27...
Connected to gmail-smtp-in.l.google.com.
Escape character is '^]'.
220 mx.google.com ESMTP y27si6889009wfi.2
HELO platter.wordtothewise.com
250 mx.google.com at your service
MAIL FROM:<steve@blighty.com>
250 2.1.0 OK y27si6889009wfi.2
RCPT TO:<playingwithtelnet@gmail.com>
250 2.1.5 OK y27si6889009wfi.2
DATA
354  Go ahead y27si6889009wfi.2
From: <steve@blighty.com>
To: <playingwithtelnet@gmail.com>
Subject: Just a test email

The body of the mail goes here.          
.
250 2.0.0 OK 1276638161 y27si6889009wfi.2
QUIT
221 2.0.0 closing connection y27si6889009wfi.2
Connection closed by foreign host.