message-cross-post-default

message-cross-post-default is a variable defined in `message.el'.
Its value is

t

Documentation:
When non-nil `message-cross-post-followup-to' will perform a crosspost.
If nil, `message-cross-post-followup-to' will only do a followup. Note that
you can explicitly override this setting by calling
`message-cross-post-followup-to' with a prefix.

You can customize this variable.

This variable was introduced, or its default value was changed, in version 22.1 of Emacs.