Event ID - 2094

Event Id2094
SourceMSExchangeIS
DescriptionThe length of the Internet Message ID for this message is greater than that which duplicate detection can handle. The message was discarded. Please set the registry value HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersPrivate_or_ParametersPublic] DWORD "Disable Duplicate Detection Over 255 bytes" to change this behavior.
Event InformationAccording to Microsoft:
To enable the hotfix for the public store, follow these steps:
1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersPublic
3. Right-click Disable Duplicate Detection Over 255 bytes, and then click Modify.
4. In the Value data box, type a value of 1 to enable the hotfix, and then click OK.
5. Quit Registry Editor.
To enable the hotfix for the private store, follow these steps:
1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersPrivate
3. Right-click Disable Duplicate Detection Over 255 bytes, and then click Modify.
4. In the Value data box, type a value of 1 to enable the hotfix, and then click OK.
5. Quit Registry Editor.
Reference LinksIn a Microsoft Exchange 2000 Server organization, some e-mail messages are not delivered when an e-mail message is sent from the Internet to multiple Exchange 2000 recipients

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