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Event ID: 134 Source: MSExchangeDX

Source
Level
Description
Error MH_RC_SESSION_BUSY returned by the MTA. (Thread 12). MH_RC_SESSION_BUSY. (DXA logging)
Comments
 
According to Microsoft copying the Microsoft Mail Administrator mailbox on outgoing dir-sync messages and then deleting these messages from both the Inbox and Deleted Items folder without reading them causes a non-read notification (NRN) to be returned to the Message Transfer Agent (MTA). The MTA fails during message conversion (MDBEF -> P2) and the message is incorrectly handled. This causes the event to appear. See ME159295 for a workaround on this issue.
As per Microsoft: "Directory synchronization may stop working between a Lightspeed Gateway that emulates a Microsoft Mail (MS Mail) postoffice and an Exchange Server computer that is the directory synchronization server. This error message may be logged in the Windows NT Event Viewer if the diagnostic logging is set to maximum". See ME201122 for more information on this problem.

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