smtp;550 5.7.1 Unable to relay for

I have setup a new server at a ISP (in internet) with Windows 2003 Server R2 64 bit and have installed Micosoft Exchanger Server 2007 sp1

After the setup I can send emails from to other servers and to my emial account, but when I reply to those messages, I get the following error:

Reporting-MTA: dns;
Received-From-MTA: dns;BAY143-W20
Arrival-Date: Sat, 23 May 2009 18:04:01 -0700

Final-Recipient: rfc822;
Action: failed
Status: 5.7.1
Diagnostic-Code: smtp;550 5.7.1 Unable to relay for

Can you please help? It have setup a SMTP connector already.
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HectorHugoGonzalezConnect With a Mentor Author Commented:
I reinstalled the Exchange Server and then added a Sender a the organization level and it worked.
You likely have a problem with your recipient policies.  It sounds like is setup, but is not.  See
Sorry that was for 2003.  In 2007 recipient policies are called email address policies.
check if you have SMTP Service installed. if yes. disable it or uninstall it...
test the mail flow
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