User only receives email from within domain

One of our users on a Windows Server 2003 SBS domain only recieves email from within the domain. This has been going on since he was set up in November 2009, but he only brought it to our attention today.  

He is using Outlook 2007.

Where would I go to troubleshoot/fix this? Is there a setting in the Exchange System Manager?

Thank you in advance.
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Glen KnightCommented:
In Active Directory Users and Computers right click on the user and select properties then under email addresses check the user has a valid email address and that it is spelt correctly
do the senders to this person get an NDR?  And if so - what is it?  

You can also track messages using the Message Tracking Center.

Open Exchange System Manager -> Tools -> Message Tracking Center

you can look at all emails rececived by the person or track individual messages
Michael ChristlyCommented:
There are a few things you can check.  The first is open exchange managment console then expand recipient configuration > Mailbox then right click the user choose properties.  Next choose mail flow settings.  Then click on message delivery restrictions click properties and verify that the user can acccept message from all users.
You can also apply this to the mailbox group so if that user is the only person in a group the problem might be on the group level.

Michael Christly
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akus1Author Commented:
This is the message that comes back: #550 5.0.0 <>... ExchangeDefender does not protect this email address ##

Original message headers:

Received: from JR-SBS08.justright.local ([fe80::6ce3:d622:88b5:2e4a]) by
 JR-SBS08.justright.local ([fe80::6ce3:d622:88b5:2e4a%10]) with mapi; Tue, 6
 Apr 2010 17:17:38 -0400
From: John Dent <>
To: "" <>
Date: Tue, 6 Apr 2010 17:17:37 -0400
Subject: test
Thread-Topic: test
Thread-Index: AcrVzpTZ5TNLS5uTQWClJWJ9OphnQw==
Message-ID: <92840D28999A7B4AADAE2195B57450883BE2D78F54@JR-SBS08.justright.local>
Accept-Language: en-US
Content-Language: en-US
acceptlanguage: en-US
Content-Type: multipart/alternative;
MIME-Version: 1.0
akus1Author Commented:
cchris15: I have verified that the user can accept messages from all users.
Glen KnightCommented:
Did you check the email address tab as per my first post?
Michael ChristlyCommented:
Is this a mac?  because i see the .local on the end of the  JR-SBS08.justright.local ?  
akus1Author Commented:
Demazter: Yes, I checked the email address tab. Everything is fine there.

cchris15: It is not a mac. That is the message that bounced back to me when I tried to email the user.

The user is able to send email sucessfully to those outside the domain, but cannot receive any emails from outside of the domain.
Glen KnightCommented:
Does your email come in via a 3rd party?
I.e do you download it via a POP3 connector?

If so have you configured it to download for this user?

And/or have you configured your 3rd party for this new user?

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demazter is right.
your mx record points to

refer to this:
Inbound messages (to the client) are bouncing with the error: ExchangeDefender does not protect this email address.    
ExchangeDefender only processes messages for email addresses that it is aware of. If you do not have your email address added as either a user or a user alias, ExchangeDefender will reject it with the error message:

“ExchangeDefender does not protect this email address”

Once you have added your email address to ExchangeDefender it can still take up to 1 hour for the new address to be allowed through our network.
akus1Author Commented:
Thank you. This was the problem.
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