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Event ID: 16025 Source: MSExchangeTransport

No DNS servers could be retrieved from network adapter <adapter>. Check if the computer is connected to a network and Get-NetworkConnectionInfo returns any results.
See EV100592 (Unable to relay outbound email - DNS query failed) for a suggestion on how to fix this event using the Set-TransportServer powershell command.
In our case we found issues with NIC drivers compatibility. We updated them to latest and issue was resolved.
As per Microsoft: "This Error event indicates the specified network adapter that is configured for internal DNS lookups on the Microsoft Exchange Server 2007 Hub Transport server or Edge Transport server is invalid". See MSEX2K3DB for information on this event.

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