I have header content filter : /FW\: +Order +Status +\#\d+/ But no effect if I send message with subject : FW: Order Status #629643 I tryed /FW\: +Order +Status +.\d+/ /FW\: +Order +Status +[#]\d+/ /FW\: +Order +Status +#\d+/ strange is, if filter was set to /FW\: +Order +Status +#/ then filter rejected message why ?