[ingo] Filtering on the message contents, not a header

[JM Coursimault]

Hello,

I'd like to filter messages both on the sender and the message contents.
But I don't see the possibility to filter on the message contents,  
only the headers.

Example :
If the subject contains "chkrootkit on mymachine.com"
and
the body contains "INFECTED" (case sensitive)
then put it in my "Alert" folder.

I'm using
horde-ingo-1.1-1mdk
horde-imp-4.1-1mdk
horde-3.1.1-1mdk

with procmail rules.

Any hints?
Thanks

-- JM