message-generate-hashcash

message-generate-hashcash is a variable defined in `message.el'.
Its value is

nil

Documentation:
*Whether to generate X-Hashcash: headers.
If t, always generate hashcash headers. If `opportunistic',
only generate hashcash headers if it can be done without the user
waiting (i.e., only asynchronously).

You must have the "hashcash" binary installed, see `hashcash-path'.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.1 of Emacs.