** Speed up handling of maildir folder.
+** Use IMAP4 non-synchronizing literals (RFC 2088) if it is available.
+
** Open following thread when you put mark on message in summary buffer.
** Use EasyPG (http://www.easypg.org) if it is available.
** maildir \e$B%U%)%k%@$N=hM}$N9bB.2=\e(B
+** IMAP4 \e$BHsF14|%j%F%i%k\e(B(RFC 2088)\e$B$KBP1~\e(B
+
** \e$B%5%^%j%P%C%U%!$G%a%C%;!<%8$K%^!<%/$r$D$1$?;~$K%9%l%C%I$r3+$-$^$9!#\e(B
** EasyPG (http://www.easypg.org) \e$B$,MxMQ2DG=$G$"$l$P;H$$$^$9!#\e(B