hashcash removal from Gnus? does anyone use it?

[Ted Zlatanov]

(also posted to the Gnus ding mailing list and to emacs-devel)

Does anyone actually use hashcash (on the receiver or sender side)?

It seemed like a good idea years ago but hasn't taken off.  Maybe it
shouldn't be so entwined with message.el and Gnus in general.  People
can still set it up individually from gnus/contrib.

Ted