550 5.7.1 Requested action not taken: message refused

Server:
SBS 2003 Exchange server

Problem:  
Messages refused from my Yahoo.com email  .    myname@yahoo.com   to    myname@companyemail.com.  
Messages accepted from my own domain email.   myname@mydomain.com   to   myname@companyemail.com


Error message:
Hi. This is the qmail-send program at yahoo.com.
I'm afraid I wasn't able to deliver your message to the following
addresses.
This is a permanent error; I've given up. Sorry it didn't work out.

<myname@mycompanyemail.com>:
68.165.104.54 failed after I sent the message.
Remote host said: 550 5.7.1 Requested action not taken: message refused.


Question:

why and what should i do in the exchange server in order to accept both from yahoo and my domain's emails?

Thanks.


happykevAsked:
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Darwinian999Commented:
Exchange is rejecting the email due to the configuration of one of its filters. The following article describes the layers of filtering for SMTP email in Exchange Server 2003 SP2 - http://www.microsoft.com/technet/technetmag/issues/2006/01/NewWeapons/default.aspx . This article also describes how to change the message generated by IMF to your own more meaningful message.

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