filtering spams using md5 (was formail -D & using hashcodes instead?)

Message has been automatically signed by PGPsendmail 1.4,
available from ftp.atnf.csiro.au:pub/people/rgooch


-----BEGIN PGP SIGNED MESSAGE-----

I've decided to do this to filter out spams:

        :0:
        *?formail -D 100000 $HOME/.messids/print_mail
        $PROCMAIL_TRASH
        :0bc
        MD5=|md5
        :0f
        |formail -I "Message-ID: $MD5"
        :0:
        *?formail -D 13000 $HOME/.messids/print_mail.md5
        $PROCMAIL_TRASH

My question is: is there a faster, more efficient way of doing this?  Things
haven't slowed substantially in my procmail script, but it's already slow and
any little optimizations can only help...

Thanks.

- -- 
Internet: dummy(_at_)c2(_dot_)org                   In real life: Robert Brown,
URL: http://www.c2.org/~dummy                          in sunny Berkeley, CA
> > Close the gap: urge a progressive property tax. << waiting for The Big One
      >> Tax the rich: vote Peace and Freedom. <<      (510) 464-4604


-----BEGIN PGP SIGNATURE-----
Version: 2.6.2

iQB1AwUBMjcK0jZMMbnCKCB9AQFphgL/ZY9FZsb1J1zdmxj8EPrjv+36Gkr23plY
Kmgx0fJNBOTB6oJtqOnddWLpa7An6ljdpa8F9c+DJ47weU8VdpvvDtnssROU/woj
0rOKMuJugouEJAv5LIlTIrBplGyRFofO
=QRk2
-----END PGP SIGNATURE-----