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The poison message queue is a special queue that is used to isolate messages that are potentially harmful to Exchange Server 2007. This queue is typically empty. If no poison messages exist, the queue does not appear in queue-viewing interfaces such as Queue Viewer. The poison message queue is
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always in a ready state. By default, all messages in this queue are suspended. You can delete the messages if you judge that they are harmful to the system. If an event that causes a message to enter the poison message queue is unrelated to the message, message delivery can be resumed. If delivery is resumed, the message enters the submission queue.
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Determining whether a message is a poison message
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A poison message is a message that has exceeded the maximum number of deliver y attempts to an application. For more information about poison message identif ication and how these messages are handled, access http://msdn2.microsoft.com/en-us/library/ ms789028.aspx.
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The unreachable queue contains messages that cannot be routed to their destinations. A transport server can have only one unreachable queue. Typically, an unreachable destination can be created when configuration changes modify the delivery routing path. All messages that have unreachable recipients reside in the unreachable queue.
When a message is received, a transport mail item is created and saved to the database, and a unique identifier is assigned to the item. If a message or transport mail item is being sent to more than one recipient, the item can have more than one destination. Each destination represents a separate routing solution for the transport mail item, and each routing solution causes a routed mail item to be created. The routed mail item refers to the transport mail item. If a transport mail item has more than one routing solution, more than one routed mail item references the same transport mail item. A single message addressed to recipients in two different domains appears as two distinct messages in the delivery queues, even if there is only one transport mail item in the database.
Quick Check
Which message queue is used to isolate messages that are potentially harmful to Exchange Server 2007 The poison message queue.
Quick Check Answer
Lesson 1: Monitoring Mail Queues
Managing and Monitoring Queues with Queue Viewer
The Queue Viewer GUI is an Exchange Management Console snap-in that is installed with the Exchange Server 2007 Hub Transport server or the Edge Transport server role. You access Queue Viewer by starting Exchange Management Console and clicking Toolbox. You use this GUI to view information about queues on a transport server and the messages that are present in those queues and to manage queues and mail items. You can use Queue Viewer to troubleshoot mail flow and identify spam. ( 6, Spam, Viruses, and Compliance, discussed configuring and enabling anti-spam features.) Queue Viewer is shown in Figure 9-1.
Figure 9-1 Queue Viewer
Before you use Queue Viewer to monitor and manage queues, you need to connect to a transport server. By default, Queue Viewer operates on the queuing database on the server on which the GUI runs. You can, however, also connect to a remote server and view the queues and messages on the remote server.
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Connecting Queue Viewer to a remote server
For more information about viewing queues on a remote server, search for How to Connect to a Server by Using the Queue Viewer in Exchange Server 2007 Help or access http://technet. microsoft.com/en-us/library/aa998669.aspx.
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You can configure the options for the Queue Viewer to control the interval at which the list of queues and messages is refreshed and the number of items that are displayed on each page.
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Queue Viewer options
For more information about conf iguring Queue Viewer options, search Exchange Server 2007 Help for How to Set Queue Viewer Options or access http://technet.microsoft.com/en-us/library/ aa995934.aspx.
You can create a filter to display the specific set of queues or messages that you want to monitor and view the property information for these queues and messages. This can help you troubleshoot potential mail flow problems, such as messages that are queued for extended periods of time, peaks in queued messages, and spikes in queued messages. In particular, you should look for large volumes of queued messages to one recipient or e-mail address. This can be a symptom of a spam attack or a denial-of-service (DoS) attack. On the other hand, a large volume of queued messages to a specific server or domain could indicate that a server is down, a service is stopped, a domain is unreachable, or a network disruption is preventing the system from establishing a connection.
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