Event ID - 21

Event Id21
SourceMSExchangeMTA
DescriptionAn MTA database server error was encountered. Stop the MTA and run the knowledge consistency checker. [valuevaluevaluevaluevaluevaluevalue] (14)
Event InformationAccording to Microsoft:
EXPLANATION:
A message transfer agent (MTA) database server error was encountered.
USER ACTION:
Stop the MTA and run the mtacheck utility.
Reference LinksExchange (MSExchangeMTA)

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