Reject emails with invalid characters

[googl...@d00d.de]

Hey,

I'm using a catchall-Domain for all those webshops etc. so that I can
easily find out who gave my email adress to someone else. Sadly, some
of these "accounts" were guessed or written by someone else (for
testing etc.). Normally, I simply add the address being spamed as a
"valid" email address and send all mails to a big googlemail-spam-
account. :)

Up to now this worked great, but now some spammer put a "|" (vertical
bar) in front of my email addresses. I'm unable to create a forwarding
account for this one, as email adresses may not contain a vertical
bar. On the other hand, postfix gladly ACCEPTS these emails and puts
them into my inbox. :(

Here's an example. "|xxx (AT) xxx.de" is the email adress, of course
my domain in question is NOT xxx.de ;)

Return-Path: <XXXXXXXXX>
X-Original-To: |xxx (AT) xxx.de
Delivered-To: catchall (AT) xxx.de
Received: from [61.95.144.114] (unknown [61.95.144.114])
by some.server (Postfix) with ESMTP id EA1AF3AC34C
for <|xxx (AT) xxx.de>; Fri, 22 May 2009 12:42:24 +0200 (CEST)
From: "dahiel Kolendreski" <XXXXXXXXX>
To: |xxx (AT) xxx.de
Subject: For |xxx (AT) xxx.de

How can I make sure that postfix rejects these wrong email addresses?
(Or is there a hack how to add email-adresses with a vertical in them
via syscp? :)

Thanks in advance,

mir