[hashcash] patch for mozilla thunderbird requested

in the feature request to add hashcash in mozilla thunderbird,

https://bugzilla.mozilla.org/show_bug.cgi?id=229686

which currently has status "WONTFIX", after i countered the arguments that caused it to get that status, the following happened:

i gave argument:

"this request is not about adding the 16 MB library, but about adding hashcash, which is simple and can be implemented in little size."

Ludovic Hirlimann then posted:

"Please provide a patch so we can figure out how much this would add and then decide if we want it in the product or not."

i'm asking hereby if someone can produce a patch to add hashcash to thunderbird, and post on there.

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