How to setup and enable outbound email with Windows Server 2003

ok call me stupid, but I need some pointers ; just installed email
services (SMPT) and setup a remote domain..how the heck does one go
about testing ability to send a simple outbound mail and what are the
execution steps ? Have no idea where to start. I am running windows
server 2003 enterprise under Computer Management, IIS, you can see
that SMTP was installed - it says "default virtual SMTP Server and
underneath it
says "domains" and also "Current sessions". Thats all thats happened.
The only think I want to do is be able to send outbound emails now,
and havent a clue how to enable this. Looking for a step by step list
if possible.

Also, I tried this: http://support.microsoft.com/kb/323350 and get
this error:

220 springserver1 Microsoft ESMTP MAIL Service, Version:
6.0.3790.1830
ready at
Mon, 10 Dec 2007 22:09:24 -0800
helo me
250 springserver1 Hello [192.168.1.10]
mail from:t...@xxxxxxxxxxxxxxxxx
250 2.1.0 t...@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx OK
rcpt to:jack_posem...@xxxxxxxxx
550 5.7.1 Unable to relay for jack_posem...@xxxxxxxxx

Thank you,
Jack
.