3.2 Mail Headers

message-required-mail-headers

See section 3.4 News Headers, for the syntax of this variable. It is (From Subject Date (optional . In-Reply-To) Message-ID (optional . User-Agent)) by default.

message-ignored-mail-headers

Regexp of headers to be removed before mailing. The default is
`^[GF]cc:\\|^Resent-Fcc:\\|^Xref:\\|^X-Draft-From:\\|
^X-Gnus-Agent-Meta-Information:'.

message-default-mail-headers

This string is inserted at the end of the headers in all message buffers that are initialized as mail.

message-generate-hashcash

Variable that indicates whether `X-Hashcash' headers should be computed for the message. See section `Hashcash' in The Gnus Manual. If opportunistic, only generate the headers when it doesn't lead to the user having to wait.