Hi Kurt,
At 01:16 17-06-2015, Kurt Jaeger wrote:
5.1. Locating the Target Host
can be read that MX records have preference, but it explizitly avoids
mentioning "A or AAAA" records if no MX is found. The sentence:
[...]
If an empty list of MXs is returned,
the address is treated as if it was associated with an implicit MX
RR, with a preference of 0, pointing to that host.
[...]
implies a A/AAAA DNS query, but does not explicitly state so.
That section explains how to locate the target host. The section
also has the following:
'the "implicit MX" rule above applies only if there are no
MX records present'
Regards,
-sm
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