On Jun 10, 2012, at 12:17 PM, Dobbins, Roland wrote:
> Clue appreciated, thanks!
Close reading of RFC 1035 shows that sending RD=1 ANY queries is taking a huge
chance.. An ANY RD=1 query to a resolver basically means 'give me what you have
in the cache', and if only if you have nothing, go out and ask for ANY from the
AUTH servers.
So you might get back an A record only, for example - even though MX records
exist. So it is just stupid to do this unless you fall back to an MX query if
you get no MX in the answer (and even then..).
Bert
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