Event ID - 754

Event Id754
SourceMSExchangeActiveSyncNotify
DescriptionSMTP could not connect to any DNS server.
Event InformationAccording to Microsoft:
Cause:

Simple Mail Transfer Protocol (SMTP) could not connect to any DNS servers. All DNS servers are down.
User Action:
Use nslookup.exe to verify that all DNS servers are up and reachable.
Reference LinksSMTP could not connect to any DNS server.

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