Mail Getting Rejected

I am getting a email rejected since i have converted over to exchange 2007 how do i make this message go through the error message is : The following organization rejected your message: p3presmtp01-05.prod.phx3.secureserver.net.
Diagnostic information for administrators:

Generating server: MASTERSRV.lantz-boggio.com

clay.benson@mortinson.com
p3presmtp01-05.prod.phx3.secureserver.net #553 sorry, relaying denied from your location [66.93.120.196] (#5.7.1) ##

Original message headers:

Received: from MASTERSRV.lantz-boggio.com by
 mastersrv.lantz-boggio.com with mapi; Mon, 23 Jul 2007
 17:30:46 -0600
From: Mark Baker <mbaker@lantz-boggio.com>
To: "Clay Benson (clay.benson@mortenson.com)"
Date: Mon, 23 Jul 2007 17:30:42 -0600
Subject: Military design build projects
Thread-Topic: Military design build projects
Thread-Index: AcfNgXykGLEMoutcQ6aZP7tSsNZSBQ==
Message-ID: <80A6C684476BAA41A1D76E3D5C59737C3582F8FBF0@mastersrv.lantz-boggio.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
acceptlanguage: en-US
Content-Type: multipart/alternative;
      boundary="_000_80A6C684476BAA41A1D76E3D5C59737C3582F8FBF0mastersrvlant_"
MIME-Version: 1.0

CulverCtAsked:
Who is Participating?
 
PC_RobCommented:
Is this happening to all of you outbound email, or just this recipient?  If it is just this one, then you may want to triple check the address you are sending to, as "unable to relay" can mean several things including an unmatched recipient address sometimes.

It may also mean that your server is listed as an open relay, and their server is rejecting your email because they have an ant-SPAM program that is checking internet blacklists.

Go here: http://www.spamhelp.org/shopenrelay/  and check your server.  If it is on the list, then you need to check your Exchange server relay settings, and restrict it.  Then you will have to follow instructions on that site for how to get your server OFF the blacklist.

Regards,

Rob
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ormerodrutterCommented:
Sounds like your Exchange server has not been relay secured.
Have a look at this MS article about open relay (it says Exchange 2000 but you can get the concept of what Open Relay is).

http://www.microsoft.com/technet/security/prodtech/exchangeserver/excrelay.mspx

A quick fix would be using a SMart Host on your SMTP connector. Smart Host is your ISP's server address or name.
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CulverCtAuthor Commented:
it is just happening to that one email address. Also checked to see if open relay is on and it is not we are locked down.
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PC_RobCommented:
Try sending a test email to that address from a yahoo or gmail account, and see if it goes through.  If so, then the address is correct, and they are receiving for it.  In that case, you can do a a new CONNECTOR in Exchange (that's what it is called in 2000-2003) to forward mail for that domain name in question to a smarthost at your ISP.  I have had to do that in the past for a domain email server or two that simply had some kind of problem with my Exchange server in negotiation.

If you would rather have your entire Exchange server forward out to a smarthost you can do that as well.

If your test email from the yahoo account comes back as failed as well, you know it is on the recipient's end.

Regards,

Rob
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ormerodrutterCommented:
SMart Host - isn't that what I suggested???
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