@code{message-elide-ellipsis}. The default value is to use an ellipsis
(@samp{[...]}).
+This is a format-spec string, and you can use @samp{%l} to say how
+many lines were removed, and @samp{%c} to say how many characters were
+removed.
+
@item C-c M-k
@kindex C-c M-k
@findex message-kill-address