(const :tag "Never" nil)
(const :tag "Always" t)))
-(defcustom message-generate-hashcash (if (executable-find "hashcash") t)
+(defcustom message-generate-hashcash (if (executable-find "hashcash") 'opportunistic)
"*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'."
+ :version "24.1"
:group 'message-headers
:link '(custom-manual "(message)Mail Headers")
:type '(choice (const :tag "Always" t)