How to skip sections of a procmailrc file?

Hi all,
   I have a system-wide procmailrc file that performs various generic 
SPAM-killing functions. A user recently subscribed to a mailing-list that 
gets posts that are currently flagged by my filters as SPAM, and hence 
killed. What I therefore want is to give the user control over the SPAM 
filtering of this email using their own $HOME/.procmailrc file.

   So basically, what I want is a recipe in my system-wide procmailrc file 
with an action that causes the mail to be immediately delivered, through the 
user's .procmailrc file. Diagramatically, it looks like this:

/etc/procmailrc
-----------
     |
     |

recipe to catch list-originated email  ----->   $USER/.procmailrc

     |
     |

system-wide SPAM killers

------------

I've considered using formail to add a "skip-me" header, but then I have to 
ensure that every SPAM-killer recipe checks for it. If I add a new 
SPAM-killer later, and forget to check, then mails will suddenly go missing.

So, I built a recipe that looks something like this:

generic recipe
-----------
:0
* ^TO_.*(spammy-list(_at_)spammy-host | @spammy-list)
| procmail <args>
-----------

Sadly, I have experienced great trouble in getting this to work. I have it 
actually processing correctly at the moment, but not in a deployable manner 
(see separate posting with subject: "problems piping to procmail").

So my question is:

Q: Are there any other ways I can use to cause procmail to branch before the 
end of one procmailrc file, and begin processing using a different file 
instead?

In case it's important, I am running RedHat 7.0, with procmail 3.14.

Thanks in advance for all help,

Cheers
Nik
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