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Undeliverable Email

Trying to email from hosted exchange (mailstreet.com) to another exchange server.
Getting "undeliverable" bounce back to particular address ie. someone@somewhere.com
Happens no matter who sends email within organization.

Delivery has failed to these recipients or distribution lists:

The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator.

Diagnostic information for administrators:

Generating server: mse21fe6.mse21.exchange.ms

#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##

Original message headers:

Received: from mse21be3.mse21.exchange.ms ([]) by
 mse21fe6.mse21.exchange.ms ([]) with mapi; Thu, 2 Apr 2009
 23:28:58 -0400
Content-Type: application/ms-tnef; name="winmail.dat"
Content-Transfer-Encoding: binary
From: Marsha Grim <marsha@xyz.com>
To: "someone@somwhere.com" <someone@somwhere.com>
Date: Thu, 2 Apr 2009 23:28:57 -0400
Subject: test1234
Thread-Topic: test1234
Thread-Index: AQHJtAxS28tAo9tMRUOXxYzdjf6HHQ==
Message-ID: <480966B183D394438D835107DA96E3E33321634748@mse21be3.mse21.exchange.ms>
Accept-Language: en-US
Content-Language: en-US
X-MS-TNEF-Correlator: <480966B183D394438D835107DA96E3E33321634748@mse21be3.mse21.exchange.ms>
MIME-Version: 1.0

1 Solution
1 of the recent updates in Microsoft Exchange (via window updates) cause hectic problems on our exchange systems. Especially if they are shared emails. Try to check settings on Exchange server just to make sure that update did not change the setitngs in these emails.
shake74Author Commented:
Was an issue with MailStreet.com servers that was causing the problem
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