In <200610311710(_dot_)15161(_dot_)julian(_at_)mehnle(_dot_)net> Julian Mehnle
<julian(_at_)mehnle(_dot_)net> writes:
Wayne Schlitt wrote:
Yes, a limit on the total number of DNS lookups is simpler for the
implementation than the 10/10/10 rule. It is, however, much harder to
count by eye.
True, but so are single atoms, and still they are being used with precision
in modern technology. Writing a lookup counter tool isn't hard. There's
no need for stuff to be counted by eye.
The idea of SPF being easy to for people to publish, even if it makes
for more work for implementations has been a key concept since near
the beginning. If you want something that requires makes use of
things other than TXT records and gives the trade off toward
easy-of-implementation, you should have backed RMX, DMP, FSV or
CallerID, not SPF.
I think it is clear that Meng made the right trade off here and that
using TXT records, a simple language that could be easily created and
checked by hand was key to the success of SPF over those other
systems.
-wayne
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