[oclug] Procmail Recipes

[Gorm Jensen]

I am trying to filter incoming email using procmail recipes.  So far,
these work:
:0:
*^Received: .*co.kr
IN-spam
:0:
*^Content-Type: .*[Kk][Ss]_[Cc]_5601-1987
IN-spam
These don't work:

SHELL=/bin/sh
# 211.200.0.0 => 211.255.25.255
BLOCKIP='211\.2[0-5][0-9]\.[0-9]\{1,3\}\.[0-9]\{1,3\}'
:0
*$^Received:.*${BLOCKIP}
{
    EXITCODE=77
    :0:
    *^*
    IN-spam
}
# 210.216.0.0 => 210.223.255.255
BLOCKIP='210\.22[0-3]\.[0-9]\{1,3\}\.[0-9]\{1,3\}'
:0:
*^Received:.*${BLOCKIP}
IN-spam

:0:
*^Received:.*210\.22[0-3]\.[0-9]\{1,3\}\.[0-9]\{1,3\}
IN-spam

The filter expressions work via grep on the mbox, but it appears that
anything involving an ip address is inoperative via procmail.  What's
wrong????