$ telnet mail.example.com 25
Trying 127.0.0.42...
Connected to mail.example.com (127.0.0.42).
Escape character is '^]'.
220 mail.example.com ESMTP
HELO mail.example.org
250 mail.example.com
MAIL FROM: <sender@example.org>
250 ok
RCPT TO: <recipient1@example.com>
250 ok
RCPT TO: <recipient2@example.com>
250 ok
RCPT TO: <recipient3@example.com>
250 ok
DATA
354 go ahead
Date: 02 Sep 2011 01:45:59 -0500
Subject: test
From: "Sender" <sender@example.org>
To: "Recipient 1" <recipient1@example.com>
CC: "Recipient 2" <recipient2@example.com>

test
.
250 ok 1314945967 qp 19908
quit
221 mail.example.com
Connection closed by foreign host.