[hashcash] outlook 2007 - postmark == hashcash-derivative

Hi

Someone pointed out to me that outlook 2007 has a feature called a
postmark, which appears to be basically hashcash.  Of course they have
a different header name and use an incompatible format.

Does anyone have any details of its format?

http://office.microsoft.com/en-us/outlook/HA100625921033.aspx

Note, if you're trying to try it out, I understand you have to send a
mail that looks spammy on the sending side before it will attach a
"postmark" stamp.

One thought is if we had format details, we could implement it, it is
a minor computational disadvantage to have to compute both, but
interop is good and its the only way to do it at this point.

Here's an example pulled off the web:

x-cr-hashedpuzzle: NFyS bc5A j3QS 7RKY TimK wQI4 e6gG 0ctr HYXb DovH fxFS
Jdwh
        1i1s Jql1 uCkh Ul9H; 1;
        y77bOxpDTTdU84beznLdhlyCkBvtnav7e0jmwetLHsyWDyqNmYgEZkwrktgY7v==;
        Sosha1_v1; 7; {Es1LZIUQ-5084-87gN-2690-KyPTlc8lQ00o};
        2hwtYzAw4i3UP7C5HvUtYxGpl6keBM1lBntb1cI3LGuoF4OS2h5Yh7xBk9guSh==;
        Wed, 26 Jul 2006 04:29:59 -0800;
        XVqZZInAS8i3kykRlep60GsOBZZbGcmu
x-cr-puzzleid: {9EA71FBF-6996-69C7-8018-4423D9A20D91}

Adam

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