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Re: Is extensibility and issue? - was XML Poll

2004-06-01 16:23:49


Neil Brown wrote:

What am I missing?

NeilBrown

I agree that extensibility *is not* an issue

The reason being, the exists: method allows arbitrary
function to be built into the server that is serving the
domain that the exists queries are being asked about.

The exists: macro language ("domain specifiers") contains
expandables for all information known at MAIL FROM: time.

To extend SPF any more would mean a "modularity violation"
where the extension would be violating the interfaces of
the layers above and below it.


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