Send Connectors settings under Hub Transport

Under Organization Configuration --> Hub Transport --> Send Connectors,

What's the meaning of the setting "Use the External DNS Lookup settings on the transport server" ?

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Mahesh SharmaConnect With a Mentor Commented:
External DNS Lookups tab to specify whether to use the DNS servers that are configured on a network adapter installed on this server or to use specific DNS servers when resolving the addresses of mail servers for external mail delivery. External DNS servers are used by Send connectors that are configured to use the external DNS lookup configuration on the transport server. When messages are routed to these Send connectors, the external DNS lookup settings that are configured for the source servers are used to resolve IP addresses for the delivery destination
Lior KarasentiConnect With a Mentor Commented:
Check this from the same question here in EE its explained really well:

"Use the External DNS Lookup settings on the transport server "

By default Exchange will use internal DNS servers - what is configured on the network card of the server.
This setting allows you to specify different external servers for Exchange to use instead of the local ones. They are used for transport only, so shouldn't affect the operation of the server for DNS.

However the setting is not used that often, and in most cases is not required.

One example would be in a very busy environment (and I mean 10,000s of messages a minute) where separate DNS servers could be used to take the load of the AD DNS servers. However the load would have to be very high to require that kind of configuration change.
AXISHKAuthor Commented:
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