+** spam \e$B$H$7$FEPO?$7$?%a%C%;!<%8$K\e(B spam \e$B%^!<%/$rIU$1$^$9!#\e(B
+
+** non-spam \e$B$H$7$FEPO?$7$?%a%C%;!<%8$+$i\e(B spam \e$B%^!<%/$r<h$j=|$-$^$9!#\e(B
+
+** ESEARCH (RFC4731) \e$B$,%5%]!<%H$5$l$^$7$?!#\e(B
+
+** \e$B?75,%*%W%7%g%s\e(B elmo-imap4-set-seen-flag-explicitly \e$B$,DI2C$5$l$^$7$?!#\e(B
+