Stephane Bortzmeyer wrote:
On Tue, Jul 27, 2004 at 01:41:52PM -0400,
Meng Weng Wong <mengwong(_at_)dumbo(_dot_)pobox(_dot_)com> wrote
a message of 26 lines which said:
There will always be domains who will find SPF impractical. The
answer for them is to publish a simple "v=spf1 ?all" record.
We can assume that future SPF implementations will allow the system
administrator to refuse policies that are "too lax" such as the one
you mention or such as "v=spf1 a:0.0.0.0/0".
It will always be possible to circumvent such restrictions simply by hiding
the wide IP range within an "exists" mechanism in a DNS record (or by similar
but different means), so there's not a lot of point trying to code up such
restrictions.
Paul.