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Event ID: 666 Source: MSExchangeMTA

Source
Level
Description
The MTA work queue is backlogged with 600 messages in the queue. [MTA SUBMIT 18 231] (14).
Comments
 
As per Microsoft: "This is by design. Network problems may be preventing messages from being delivered or the message transfer agent (MTA) service may have stopped". See MSEX2KDB for additional information about this event.
The work queue alarm may log this event to notify the administrator when the work queue reaches a certain size. See ME163085 for more details.

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