Email Error

A user in our domain sent an email message to to someone in another company and received this below in reply:

#< #5.0.0 X-Spam-&-Virus-Firewall; host mail.us.messaging.microsoft.com[216.32.181.178] said: 550 5.4.1 Relay Access Denied (in reply to RCPT TO command)> #SMTP#

Why is the message being rejected. something on my end?
Thanks.
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tolinromeAsked:
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systechadminConsultantCommented:
Is cleint is using Outlook Client if it is so then ask user to enable the SMTP authentication in Oulook settings
tolinromeAuthor Commented:
yes, it's outlook. is that what the problem is, the user needs to enable smtp authentication in Outlook? Ok.
tolinromeAuthor Commented:
doesnt seem to be smtp authentication.
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tolinromeAuthor Commented:
Anyone? Here's the NDR.

Diagnostic information for administrators:

Generating server: barracuda.abc123.com

sharon.Lawver@siriusxm.com
#< #5.0.0 X-Spam-&-Virus-Firewall; host mail.us.messaging.microsoft.com[216.32.181.178] said: 550 5.4.1 Relay Access Denied (in reply to RCPT TO command)> #SMTP#

Original message headers:

X-ASG-Debug-ID: 1332258626-771d240d0001-a2qqhF
Received: from mail2010.abc.local ([10.1.10.68]) by barracuda.abc123.com  with ESMTP id YeID7H3DJa9eUqiv for <sharon.Lawver@siriusxm.com>; Tue, 20 Mar
 2012 11:50:26 -0400 (EDT)
X-Barracuda-Envelope-From: slerman@abc123.com
X-Barracuda-RBL-Trusted-Forwarder: 10.1.10.68
Received: from mail2010.abc.local ([::1]) by mail2010.abc.local
 ([::1]) with mapi id 14.01.0355.002; Tue, 20 Mar 2012 11:50:25 -0400
From: shawn Lerman <slerman@abc123.com>
X-Barracuda-BWL-IP: ::1
X-Barracuda-BBL-IP: ::1
X-Barracuda-RBL-IP: ::1
To: "'sharon.Lawver@siriusxm.com'" <sharon.Lawver@siriusxm.com>
CC: denise Hicks <dhicks@abc123.com>, rob Aguilar <raguilar@abc123.com>
X-ASG-Orig-Subj: FW: NY-0528-15069
Subject: FW: NY-0528-15069
Thread-Topic: NY-0528-15069
Thread-Index: Ac0BNJy6jlIkyLn7QjGbz+rPk0+QUwAtveZAAHMOcHAAvJSrYAABvdcw
Importance: high
X-Priority: 1
Date: Tue, 20 Mar 2012 15:50:24 +0000
Message-ID: <2C3A22B8DD2EDF4CAC6DC90FA18829B40AA0BB@mail2010.abc.local>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator:
x-originating-ip: [10.1.20.36]
Content-Type: multipart/mixed;
      boundary="_005_2C3A22B8DD2EDF4CAC6DC90FA18829B40AA0BBGTPMAIL2010gtploc_"
MIME-Version: 1.0
X-Barracuda-Connect: UNKNOWN[10.1.10.68]
X-Barracuda-Start-Time: 1332258626
X-Barracuda-URL: http://10.1.10.30:8000/cgi-mod/mark.cgi
X-Virus-Scanned: by bsmtpd at abc123.com
PapertripCommented:
I telnet'd to the destination MX server and it accepted the RCPT TO, so the problem does not appear to be on their side.

Run your sending IP(s) through http://mxtoolbox.com/blacklists.aspx and see if you are listed anywhere.

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tolinromeAuthor Commented:
My sending IP's are not on any blacklists. Here are the results to their MX server below it fails on the relay and this isnt even coming from my server but MXtoolbox:

EHLO please-read-policy.mxtoolbox.com
250-CH1EHSMHS008.bigfish.com Hello [64.20.227.133]
250-SIZE 157286400
250-PIPELINING
250-ENHANCEDSTATUSCODES
250-STARTTLS
250-AUTH
250-8BITMIME
250-BINARYMIME
250 CHUNKING [47 ms]
MAIL FROM: <supertool@mxtoolbox.com>
250 2.1.0 Sender OK [31 ms]
RCPT TO: <test@example.com>
550 5.4.1 Relay Access Denied [47 ms]
QUIT
221 2.0.0 Service closing transmission channel [31 ms]
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