Event ID - 9405

Event Id9405
DescriptionAn unexpected error has occurred which may cause the MTA to terminate. Error: <error code>. [<value> <value> <value>] (16)
Event InformationAccording to Microsoft:
The MTA code that generates the text file GWART0.MTA did not use a data structure large enough to accommodate the routing information obtained through directory replication.
There is no workaround for this problem.

The Microsoft Exchange Server disk may be full or a disk error may have occurred. The message transfer agent (MTA) service will stop if the disk is full. If the Microsoft Exchange Server disk is full, delete any unnecessary files. If you suspect a disk error, run Chkdsk. Verify that the \Exchsrvr\Mtadata directory exists. Stop and restart the MTA service. If the error persists, run the Mtacheck.exe utility. Stop the MTA service, open a command prompt, and type Mtacheck/v /f c:\mta.txt. If Mtacheck removes objects from a database queue, it places each damaged object in a Db*.dat file in \Exchsrvr\Mtadata\Mtacheck.out.

To resolve this behavior, stop the MTA service, and then follow these steps:
1. Start Registry Editor (Regedt32.exe).
2. Locate the following registry key:
3. Double-click the RAS LAN-MTA DMOD threads value, and increase the data value from 2 to 4.
4. Double-click the Concurrent Connections to RAS LAN-MTAs value, and increase the data value to 10.
5. Quit Registry Editor.
6. Restart the MTA
Reference LinksXCON: MTA Terminates Unexpectedly with Event ID 9405

The Microsoft Exchange MTA Stacks service cannot start after you install Exchange Server 2003

XCON: Emsmta.exe Causes Access Violation In EMSMTA!HeapCheckFree

XFOR: MTA Terminates Unexpectedly with Event ID 2051 and 9405

XCON: MTA Service on RAS Bridgehead Server Stops Repeatedly with Events 9315, 9405

XCON: MTA Cannot Start Without a Private Information Store

XCON: MTA Terminates After Receiving Mail from Zoomit Gateway

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