bj@schmong:~$ telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.localdomain.
Escape character is '^]'.
220 schmong.org ESMTP Sendmail 8.13.4/8.13.4/Debian-3sarge3; Fri, 4 May 2007 14:14:38 -0400; (No UCE/UBE) logging access from: localhost.localdomain(OK)-localhost.localdomain [127.0.0.1]
HELO schmong.org
250 schmong.org Hello localhost.localdomain [127.0.0.1], pleased to meet you
MAIL FROM: bj@schmong.org
250 2.1.0 bj@schmong.org... Sender ok
RCPT TO: bj@schmong.org
250 2.1.5 bj@schmong.org... Recipient ok
DATA
354 Enter mail, end with "." on a line by itself
From: bj@schmong.org
To: bj@schmong.org
Subject: Test

Test
.
250 2.0.0 l44IEcHp030353 Message accepted for delivery