=local:user:uid:gid:homedir:dash:ext:
は
home-dir/.qmaildashext
で制御される。
=elena:fukachan:0:0:/a:-:elena:
は /a/.qmail-elena に制御される。
+loc:user:uid:gid:homedir:dash:pre:
        IS EQUIVALENT TO
=locext:user:uid:gid:homedir:dash:preext:
Example 1: ext == -ctl
   +elena:fukachan:0:0:/a:-:XXX:
	      =>
   =elena-ctl:fukachan:0:0:/a:-:XXX-ctl:
	by /a/.qmail-XXX-ctl
Example 2: really ?
assume "ext == ctl", so we expect the following behaviour:
   +elena-:fukachan:0:0:/a:-:XXX:
	      =>
   =elena-ctl:fukachan:0:0:/a:-:XXXctl:
   controlled by /a/.qmail-XXXctl