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What types of Exchange transport queues are there?

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I can monitor mail and transport queues of Microsoft Exchange servers with several native sensors of PRTG. What are the different kinds of Exchange transport queues and what are they used for?

exchange exchange-powershell exchange-queue mail-queue message-queue microsoft prtg queue transport-queue

Created on Jul 12, 2013 9:42:20 AM by  Gerald Schoch [Paessler Support]



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This article applies to PRTG Network Monitor 13.2.5 or later

Types of Transport Queues in Microsoft Exchange

There are two types of out of the box sensors for monitoring Exchange queues: the Exchange Mail Queue Powershell Sensor and the WMI Exchange Transport Queue Sensor. Both can monitor various values of an Exchange queue, such as the length of specific queues.

A queue can be defined as “a temporary holding location for messages that are waiting to enter the next step of processing”, or as the number of messages with the same status. Different server roles determine on which computers the messages are going to be queued:

  • the Edge Transport role for messages coming from and going to the Internet, and
  • the Hub Transport role for messages within the Exchange organization.

The routing of a message determines the type of queue in which a message is stored. There are five types of queues in Exchange holding different kinds of messages:

  • Submission Queue: messages that have to be resolved, routed, and processed by transport agents
  • Mailbox Delivery Queue: messages being delivered to a mailbox server by using encrypted Exchange RPC
  • Remote Delivery Queue: messages being delivered to a remote server via SMTP
  • Poison Message Queue: isolated messages considered being harmful to the Exchange system after a server failure; typically empty; messages in this queue are suspended by default
  • Unreachable Queue: messages that cannot be routed to their destinations

The PowerShell sensor for Exchange mail queues shows an additional channel: Retrying Mails. This channel sums up the messages that cannot be successfully delivered but have a renewed connection attempt with the destination domain.

For more information regarding transport queues, queue database files, options for configuring and management, etc., please refer to the following article in Microsoft’s TechNet:

Created on Jul 12, 2013 9:46:19 AM by  Gerald Schoch [Paessler Support]

Last change on Jul 12, 2013 2:05:11 PM by  Gerald Schoch [Paessler Support]



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Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.