In <200606101451(_dot_)43430(_dot_)julian(_at_)mehnle(_dot_)net> Julian Mehnle
<julian(_at_)mehnle(_dot_)net> writes:
Wayne Schlitt wrote:
The 'i' and 'd' macros aren't actually a problem because they can be
easily cached. To quote RFC4408 section 8.1. "Macro Definitions": [...]
To be exact, all macros can be cached (except "t", timestamp, of course).
It just requires a larger cache, statistically.
The point is that the text included in the RFC gives you a clear idea
of what MS thinks about what is reasonably cached and that was the
original subject. Knowing the IP and domain will let you correctly
cache the vast majority of SPF records. Everything else is way past
the point of diminishing returns.
Oh, the 't' and 'r' macros aren't supposed to be used in mechanisms
anyway, only in the exp= text, so these aren't problems.
-wayne
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