@vindex wl-draft-use-cache
\e$B=i4|@_Dj$O\e(B @code{nil}\e$B!#Aw?.$9$k%a%C%;!<%8$r%-%c%C%7%e$9$k$+$I$&$+$r<($9%U\e(B
\e$B%i%0$G$9!#\e(BNon-nil \e$B$J$i%-%c%C%7%e$7$^$9!#$?$@$7\e(B @code{wl-insert-message-id}\e$B$,\e(B
@vindex wl-draft-use-cache
\e$B=i4|@_Dj$O\e(B @code{nil}\e$B!#Aw?.$9$k%a%C%;!<%8$r%-%c%C%7%e$9$k$+$I$&$+$r<($9%U\e(B
\e$B%i%0$G$9!#\e(BNon-nil \e$B$J$i%-%c%C%7%e$7$^$9!#$?$@$7\e(B @code{wl-insert-message-id}\e$B$,\e(B