MC_(FORWARDED), MC_(NOT_FORWARDED),
MC_(LOCKED), MC_(NOT_LOCKED),
MC_(SPAM),MC_(NOT_SPAM),
+ MC_(HAS_ATTACHMENT), MC_(HAS_NO_ATTACHMENT),
+ MC_(SIGNED), MC_(NOT_SIGNED),
MC_(PARTIAL), MC_(NOT_PARTIAL),
MC_(COLORLABEL), MC_(NOT_COLORLABEL),
MC_(IGNORE_THREAD), MC_(NOT_IGNORE_THREAD),