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Event ID: 2050 Source: MSExchangeMTA

Source
Level
Description
A fatal internal MTA error occurred. Contact Microsoft Product Support Services. An illegal PUT to element 1C87FF00 occurred at offset <offset>. [BASE XFER- IN 21 9] (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.

Also, see ME176130 for more detals on this issue.

As per Microsoft: "The message transfer agent (MTA) either encountered an invalid object and cannot process it, or it has database corruption". See MSEX2K3DB for additional information about this event.
As per Microsoft: "The Zoomit gateway may have sent a message with an improperly encoded content length. Improperly encoded messages may cause the MTA to terminate unexpectedly". See ME151395 and ME183014 to fix this problem.

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