[root@www root]# telnet localhost 25

# you should see a response like

Trying 209.x.x.x...
Connected to localhost.
Escape character is '^]'.
220 www.foo.bar.com ESMTP Sendmail 8.11.6/8.11.6; Tue, 31 Dec 2002 22:43:55 -0600

# type this

helo localhost

250 www.foo.bar.com Hello www.foo.bar.com[209.x.x.x], pleased to meet you

# type quit to logout

quit
221 2.0.0 www.foo.bar.com closing connection
Connection closed by foreign host.
[root@www root]# 

##</code><code>##

$ sendmail -t
To: me@mysite.com
Subject: Sendmail

That worked
.
$