Sender filter almost complete, any comments?

Well, it's almost complete now.  It works but I think I might have to 
tweak it.


# If the recipient is NOT in the recipient whitelist,
# AND the sender contains a string from BLACKLIST, treat
# as junk. This is predominantly to detect "joe jobbing"
:0
* ^X-Original-To:["$WS"]*\/.*
* $! ? grep -i -x $MATCH $RCPT_WHITELIST
{
        :0:
        _CLEAN_FROM_USER=|formail -IReply-To: -rtzxTo: | awk -F@ '{print $1}'
        * $? echo '$CLEAN_FROM_USER' | grep \"`grep -v '^[$WS]*$' 
$FROM_BLACKLIST`\"
        $FROMJUNK
}


1.
Is it arranged correctly?

2.
It complains:
Couldn't determine implicit lockfile from "formail -IReply-To: -rtzxTo: 
| awk -F@ '{print $1}'"

Should I be specifying a manual lockfile here, or is it because my 
layout isn't optimal?

3.
I could replace:   grep -v '^[$WS]*$' $FROM_BLACKLIST
with:   sed '/^[$WS]*$/d' $FROM_BLACKLIST

With a file of 5,000 lines, grep was a fair bit quicker.  Have I 
answered my own question?


Many thanks,
Steve :)

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