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Event ID: 2051 Source: MSExchangeMTA

Source
Level
Description
A fatal internal MTA error occurred. Contact Microsoft Technical Support. An illegal GET from element 5CF03901 occurred at offset 1. [BASE XFER-IN 23 70] (16)
Comments
 
This event might occur when the MTA is processing a message. See ME319846 for a hotfix applicable to Microsoft Exchange Server 5.5.

See ME157058 and MSEX2K3DB for additional information about this event.
As per Microsoft: "The MTA may experience a performance problem expanding extremely large distribution lists. The problem can also be triggered if the Recipient Name field being transferred into the MTA is larger than the buffer space available". Check the Following Microsoft articles for more details: ME174600, ME177328, ME166519 and ME197398.

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