lost mail bodies?

I've got the following recipe in my ~/.procmailrc file...

# --- Mail from various people whose mail I want to keep separate copies of ---
#
:0 Whc:
* ^From.*torvalds
IN.linus

However, very often (but not always), all I'm getting in these
messages in that mailfile beheaded!  The headers are all there, but no
body!

What am I doing wrong?