procmail rule

[Jeff Macdonald]

anybody know a smart way to ignore any charset but US-ASCII? I currently
have rules like this one:


:0 h
* ^Content-Type: text/html; charset="euc-kr"
* !^X-Loop: jeff.macdonald at virtualbuilder.com
| (formail -r -I"Precedence: junk" \
        -A"X-Loop: jeff.macdonald at virtualbuilder.com" ; \
        echo "I only know english. I never saw your message.\
	 Stop sending me junkmail!") | $SENDMAIL -t

with 3 different charsets.

TIA!