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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.