Event ID - 754

Event Id754
DescriptionSMTP could not connect to any DNS server.
Event InformationCAUSE:
Simple Mail Transfer Protocol (SMTP) could not connect to any DNS servers. All DNS servers are down.

Use nslookup.exe to verify that all DNS servers are up and reachable.
Reference LinksMicrosoft product: Exchange Version: 6.5.6940.0 Event Source: MSExchangeTransport Event ID: 754

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