The default value is @samp{"The following message is a courtesy copy of
an article\\nthat has been posted to %s as well.\\n\\n"}.
+@item message-fcc-externalize-attachments
+@vindex message-gcc-externalize-attachments
+If @code{nil}, attach files as normal parts in Fcc copies; if it is
+non-@code{nil}, attach local files as external parts.
+
@end table