Re: "hashcash survey: Please reply if you are using it"

Alberto Luaces <[email protected]> writes:

> Andrew Cohen <[email protected]> writes:
>
>> Using hashcash?
>
> I do, but it's useless, so it wouldn't matter that it disappeared.

There's a derived implementation "Email Postmark Validation Algorithm"
which at least was supported till about 2014:
https://web.archive.org/web/20140425234054/http://office.microsoft.com/en-au/outlook-help/discontinued-features-and-modified-functionality-in-outlook-2010-HA010354944.aspx

Strangely the specification documentation was still updated in 2022:
https://learn.microsoft.com/en-us/openspecs/exchange_server_protocols/ms-oxpsval/f894e839-22a2-4f72-a1af-a7de40089bc8#published-version

https://en.wikipedia.org/wiki/Hashcash

I also think it's not useful anymore.