Setup a new Exchange 2010 Server

I am working on a test system at home.  I have everything setup where I think it should work, however I seem to have an issue.  The way the network is setup is static IPs, one for the router, and one for the Server, which is running Windows 2008 R2, it is a domain controller, DNS, Exchange 2010 Server, IIS7 Server.  It does it all.  Have to as I only have one computer to use at this time.  IIS7 works fine, as I can get to a web page on the server, so routing is working.  Exchange 2010 seems to be working fine internally as I can send emails to one account to another just fine.  However if I send a message outside nothing happens, the email just goes off and never arrives.  If I sent a message inbound it bounces back with the following error:

This is the mail system at host smtp15.relay.dfw1a.emailsrvr.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                  The mail system

<iwindon@450p.com>: host 99.28.107.226[99.28.107.226] said: 530 5.7.1 Client
   was not authenticated (in reply to MAIL FROM command)
Reporting-MTA: dns; smtp15.relay.dfw1a.emailsrvr.com
X-SMTP-Server-Queue-ID: F3D253001F6
X-SMTP-Server-Sender: rfc822; iwindon@ghpstudios.com
Arrival-Date: Sat, 13 Nov 2010 10:06:59 -0500 (EST)

Final-Recipient: rfc822; iwindon@450p.com
Original-Recipient: rfc822;iwindon@450p.com
Action: failed
Status: 5.7.1
Remote-MTA: dns; 99.28.107.226
Diagnostic-Code: smtp; 530 5.7.1 Client was not authenticated
Return-Path: <iwindon@ghpstudios.com>
Received: from localhost (localhost.localdomain [127.0.0.1])
      by smtp15.relay.dfw1a.emailsrvr.com (SMTP Server) with ESMTP id F3D253001F6
      for <iwindon@450p.com>; Sat, 13 Nov 2010 10:06:59 -0500 (EST)
X-Virus-Scanned: OK
Received: by smtp15.relay.dfw1a.emailsrvr.com (Authenticated sender: iwindon-AT-ghpstudios.com) with ESMTPA id 9567130017C
      for <iwindon@450p.com>; Sat, 13 Nov 2010 10:06:59 -0500 (EST)
From: Ivan Windon <iwindon@ghpstudios.com>
Content-Type: multipart/alternative; boundary=Apple-Mail-1--31502846
Subject: test
Date: Sat, 13 Nov 2010 09:07:05 -0600
Message-Id: <B52DBECF-AC38-46FA-90A1-FCB2C32D4EB9@ghpstudios.com>
To: iwindon@450p.com
Mime-Version: 1.0 (Apple Message framework v1081)
X-Mailer: Apple Mail (2.1081)

I have an MX record pointing to the public IP address of the server.

I ran some SMTP tests as well and it says something along the lines of Client
   was not authenticated.  I'm thinking I need to setup Exchange to allow anonymous connections?  Is this the route I need to go?

Thanks,

Ivan