3.2 Mail Headers
- See News Headers, for the syntax of this variable. It is
(From Subject Date (optional . In-Reply-To) Message-ID
(optional . User-Agent)) by default.
- Regexp of headers to be removed before mailing. The default is
- This string is inserted at the end of the headers in all message
buffers that are initialized as mail.
- Variable that indicates whether ‘X-Hashcash’ headers
should be computed for the message. See Hashcash. If
opportunistic, only generate the headers
when it doesn't lead to the user having to wait.