John Levine wrote:
Er, so? If the tool to bundle up the needed bits for SPF-as-text and
SPF-as-binary are similarly trivial, why should we care if people who
want to use a feature of the Internet can't persuade their provider to
make a trivial change.
Because there's no point in checking records that don't exist. RFC
4408 has been out for six years, and people who run large mail systems
report that the number of type 99 records is basically zero. To
several significant digits, all type 99 queries are wasted traffic.
However, that was the original migration path expected which has
finally materialized - Getting clients to support both record types 99
and TXT first before recommending type 99 only publishing can be
considered. It would not have been feasible nor reasonable to
recommend type 99 only publishing in 4408.
To the surprise of many, clients are doing the expected behavior of
dual type queries - all expected to come with a short term waste.
Now its time for the BIS update to declare, pardon the pun, "Route 99"
is now paved and safe to drive (begin publishing type 99 records).
--
HLS
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