mouss:
> - with MX:
> 1- lookup MX: returns say host.example.com

Typically, the result also contains an additional information
section with the A records, and perhaps some name server records.
These will be cached by the local DNS server, subject to sanity
checks.

> 2- lookup A for host.example.com

Which will already be cached by the local DNS server.

        Wietse

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