mathew <meta(_at_)pobox(_dot_)com> wrote:
On Mon, Nov 17, 2008 at 21:14, Seth <sethb(_at_)panix(_dot_)com> wrote:
Barry Shein <bzs(_at_)world(_dot_)std(_dot_)com> wrote:
Spammers? Sure, they can try.
They can buy a stamp and keep on re-using it.
Just like people can buy an Amazon gift voucher (which is simply a
code they enter on Amazon's web site) and keep re-using it?
You'll note they buy it _from_ Amazon and use it _for_ Amazon.
That's fine for Amazon. But other websites can't take Amazon gift
certificates, unless they have a deal with Amazon (in which case
Amazon does the validation for them). This is a single point of
failure; but since they're Amazon certificates, it's acceptable for
Amazon to be a single point of failure.
Seth
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