SirCam and sieve

[Nick Sayer]

I really, really want to do this:

if body :is :comparator "i;octet" text:
I send you this f i l e in order to have your a d v i c e
.
        reject "Possible SirCam Infection";
        stop;
}

(note that I have perturbed the line a bit in order for this message not 
to match the worm's signature. I am sure you all know what I'm talking 
about)

Is there no way for the sieve to match on lines in the body? This would 
be the next extension I would like to see.