Event ID - 1278

Event Id1278
DescriptionA locally-initiated %2 session-level transport connection to %4 was closed. Control block index = %1. [ %5%6%7%8] (8)
Event InformationAccording to Microsoft:
A session-level transport connection initiated by this server was closed.
Look for other errors in the Event logs to try to determine the reason for the connection being dropped.
Reference LinksExchange (MSExchangeMTA)

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