no incomming mail. on the newest added domain to exchange 2010

Dear Experts,
something wiered is happening
i have aquired a domain for a client the domain is i aquired it by godaddy anad assigned it to my own DNS by the datacenter, the main use of the domain would be hosted exchange for the client's business.

i added the domain to acepted domains in the exchange organization and created usernames and passwords in AD as i used to with every other client,
the only problem with this DOmain is, the outgoing mail is working perfect, but the incomming mail is not comming in at all.
i thought something is wrong with the server but actually all other 100 email domains are all working pretty fine without a single glitch i even added another domain after this one, and it worked pretty fine,
this is what i got back from google when i tried to send anything to this address BTW i was truying to reply to the message comming out of that server.

Sorry, we were unable to deliver your message to the following address.

Remote host said: 550 5.7.1 Unable to relay [RCPT_TO]

--- Below this line is a copy of the message.

Received: from [] by with NNFMP; 01 Apr 2011 01:23:10 -0000
Received: from [] by with NNFMP; 01 Apr 2011 01:23:10 -0000
Received: from [] by with NNFMP; 01 Apr 2011 01:23:10 -0000
X-Yahoo-Newman-Property: ymail-3
Received: (qmail 47010 invoked by uid 60001); 1 Apr 2011 01:23:10 -0000
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;; s=s1024; t=1301620990; bh=k37Plzv3ce63bFMJgEkTOfLS9hN0bd+zH8sEcNpIHxo=; h=Message-ID:X-YMail-OSG:Received:X-Mailer:Date:From:Subject:To:MIME-Version:Content-Type; b=uaDh+l0L6GnTu8XApy1c4oyBHTg/i/V6uCTP7CV9FmZMM6L9sRhb32UjyJz4Fi5vJZl9xlRmjcgjC5yDjA/ZgBJY7nJaltCB62W7JYS1UojcFkKUXdRr2BHnMH1Ty3SYmbppA3sDe8nzXFiy7D89ZS13V+SSD9imvzROG7mYb04=
DomainKey-Signature:a=rsa-sha1; q=dns; c=nofws;
Message-ID: <>
Received: from [] by via HTTP; Thu, 31 Mar 2011 18:23:09 PDT
X-Mailer: YahooMailRC/559 YahooMailWebService/
Date: Thu, 31 Mar 2011 18:23:09 -0700 (PDT)
From: Shady Kiwan <>
Subject: email tests
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="0-417060098-1301620989=:46497"

Content-Type: text/plain; charset=us-ascii

helo can this go through

Content-Type: text/html; charset=us-ascii

<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt"><div>helo can this go through<br></div>
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here is my ping. Is your server?
What is the MX record for the domain?

Ping request could not find host Please check the name and try again.


Pinging [] with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.

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