Event ID - 21146

Event Id21146
SourcePOP Intrusion Detection Filter
DescriptionMicrosoft ISA Server SMTP Message Screener failed to start.
Event InformationAccording To Microsoft:
The ISA Server SMTP Message Screener failed to allocate memory.

Free up memory. Close other programs that are running. Use the Task Manager to check programs and processes that are using large amounts of system resources.Restart the service hosting the message screener sink filter.Reinstall the message screener filter.
Reference LinksMicrosoft product: Internet Security and Acceleration Server Version: 4.0.3443.594 Event Source: POP Intrusion Detection Filter Event ID: 21146

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