Exchange error delivering mail: 550 5.2.0 RESOLVER.CON.NoTarget

All users in organization "" is unable to deliver mail to ONE person in orgnization "".
All users in organization "" is able to deliver mail to all other persons in orgnization "".
Both organizations have Exchange 2007.

Some of the error message is in norwegian, but I hope you understand the problem:

Diagnoseinformasjon for systemansvarlige:
Genererende server: server02.terra.local
#550 5.2.0 RESOLVER.CON.NoTarget; contact's external address is missing ##
Opprinnelige meldingshoder:
Received: from server01.terra.local ([]) by
 server02.terra.local ([]) with mapi; Wed, 7 Apr 2010 11:49:49
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: =?iso-8859-1?Q?GTN_=28LB=29?=
To: =?iso-8859-1?Q?PD_=28LK=29?=
Date: Wed, 7 Apr 2010 11:49:48 +0200
Subject: SV: fopall
Thread-Topic: fopall
Thread-Index: AcrWNqx+lV944HykR0q9RNxsw5U7RQAAPd2w
Message-ID: <81ED6277A71EAF4587B135DE3F6489C6028A7F2F1905@server01.terra.local>
References: <1DB7ACF30E3236439BB729ADFF5A21C810C0858AAC@skuld.asp.local>
In-Reply-To: <1DB7ACF30E3236439BB729ADFF5A21C810C0858AAC@skuld.asp.local>
Accept-Language: nb-NO
Content-Language: nb-NO
X-MS-Has-Attach: yes
X-MS-TNEF-Correlator: <81ED6277A71EAF4587B135DE3F6489C6028A7F2F1905@server01.terra.local>
MIME-Version: 1.0
Who is Participating?
MrLonandBConnect With a Mentor Commented:
If this addressee is in fact a true Contact, I would suggest deleting the Contact from Active Directory and re-creating it.
Johnet_DatasystemerAuthor Commented:
I'm not shure if he is created as a Contact in AD. I'll check it out.
Johnet_DatasystemerAuthor Commented:
The contact in exchange org "" was deleted and re-created. Still no luck sending e-mail to this contact. There might be a delay before seeing any result because of address list updating/synchronizing.
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Shreedhar EtteConnect With a Mentor Commented:

Add a Extenal Email Address to the contact you have created. Then send a message.

Also i would like to know whey you have create a Mail Contact?

Johnet_DatasystemerAuthor Commented:
I do not know why "" creates contacts in AD. (Strange policy if you ask me.) The IT manager in that organization has reported problem with the company hosting their exchange servers.
Old thread, but i just got this problem after a migration to office365.
The migration set some weird options on the old exchangeserver.

For me it was that the "External E-mail Address" was gone from the Mail Contact in the Exchange server. So just had to edit the contacts and change the smtp-address to be external.
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