Mailing List Archive: Developer's Guide added to SPF website

The best guess:
"a/24 mx/24 ptr"
is IPv4 only. Is there any chance we should include IPv6 also (at least those MTAs with IPv6 support)? I mean, who knows how long this feature will be used...

Scaled from IPv4, it would be something like this:
"a/24//96 mx/24//96 ptr"

But perhaps this would be too restrictive. Based on the ARIN policies, I'm pretty sure that:

/48 is the norm for a site
/64 is considered "one subnet"

so, maybe "a/24//64 mx/24//64 ptr"?

(thanks to Wayne for notifying me of the SPF "a//v4//v6" subnet formatting)

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