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Outlook 2010 cannot send mail within domain

I have  new computer installed into my SBS 2011 domain. Using Office 2010. User cannot send email to other users within the domain. All messages returned with SMTP code 5.1.1. User cannot be found.
This user was able to send to other users in the domain on her old computer. She can send to outside addressees with no problem.


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1 Solution
can you send mail using telnet ?

i'm betting probably not. force the server to rebuild the offline address book and the clients to redownload it.

here are some basics on the OAB. it seems the server thinks the user does not exist.

can all other users send to each other and the problem user?
Thomas WERNHERConfiguration ManagerCommented:

can you try by adding an smtp adress in the exchange account of your user with the UPN of the user for the smtp address ? ?

llovingAuthor Commented:
More testing. This user cannot send to any local address within the domain from any computer when logged in under her profile. However if she replys to a message from within the domain that reply is delivered sucessfully.
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llovingAuthor Commented:
More data.

Here is the content of the NDR.

Diagnostic information for administrators:
Generating server: MWSERVER03.mwoffice.local
#550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found ##
Original message headers:
Received: from MWSERVER03.mwoffice.local ([fe80::4ca6:61be:a1e0:d0c7]) by
 MWSERVER03.mwoffice.local ([fe80::4ca6:61be:a1e0:d0c7%10]) with mapi id
 14.01.0339.001; Tue, 5 Feb 2013 11:42:36 -0500
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: Hether Peyton <>
To: "Jimmy Walker ("
Subject: testing
Thread-Topic: testing
Thread-Index: Ac4Dv8uX5qggU8FSR2qCguwxEOOCUg==
Date: Tue, 5 Feb 2013 11:42:35 -0500
Message-ID: <393416E36FB7E440AAD38F73BF8B8BD63D1738DC@MWSERVER03.mwoffice.local>
Accept-Language: en-US
Content-Language: en-US
X-MS-TNEF-Correlator: <393416E36FB7E440AAD38F73BF8B8BD63D1738DC@MWSERVER03.mwoffice.local>
MIME-Version: 1.0
X-Originating-IP: []
Thomas WERNHERConfiguration ManagerCommented:

as mentionned before, does the user have jwalker@mwoffice.local (for which i think mwoffice.local is the internal dns name ?) in her smtp adresses ?
(in addition of her normal external mail address ?)

llovingAuthor Commented:
Back to the grind. Yes all users have both the internal and external addresses in ther SMTP addresses. Ex: jwalker@mydomain.local and

llovingAuthor Commented:
Solved the issue by creating a new user account on Exchange server.
llovingAuthor Commented:
Not sure why but the user account with the problem seemed to be the culprit. Deleted that account and created a new mail account for that user. Problem went away.
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