* message.el (message-from-style, message-interactive)

* message.el (message-from-style, message-interactive)
(message-cite-prefix-regexp, message-sendmail-envelope-from)
(message-yank-prefix, message-indentation-spaces, message-signature)
(message-signature-file, message-default-headers): For GNU Emacs, set
default values from the corresponding mail-* variables.
(message-send-mail-with-sendmail): Use envelope-from only if
mail-specify-envelope-from is non-nil.