Sending mail as different user

# telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 hostname SMTP Server (JAMES SMTP Server 2.2.0) ready Mon, 20 Feb 2006 14:31:33 -0500 (EST)
ehlo yourEmailAddressDomain.com
250 hostname Hello yourEmailAddressDomain.com (hostname [127.0.0.1])
mail from:
250 Sender OK
rcpt to:
250 Recipient OK
data
354 Ok Send data ending with .
subject: test to testuser at JAMESServersConfigSetting.com

test

.
250 Message received
quit
221 hostname Service closing transmission channel
Connection closed by foreign host.
#