X-Original-To after bcc contains wrong address

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X-Original-To after bcc contains wrong address
\ Benjamin Schmidt (23 Jul 2007)
. \ Benjamin Schmidt (23 Jul 2007)

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Subject:	X-Original-To after bcc contains wrong address
Group:	Postfix-users
From:	Benjamin Schmidt
Date:	23 Jul 2007

Hello list members

Have another problem. I need to pipe all emails to a perl-script, while
keeping the original recipient address (in "X-Original-To"). But this
doesn't work by me, like its descripted in thread
http://www.webservertalk.com/archive281-2004-8-363421.html.

---
recipient_bcc_maps = hash:/etc/postfix/recipient_bcc_maps.cf
* alias

transport_maps = hash:/etc/postfix/transport_maps.cf
alias virtual_alias_maps:

virtual_alias_maps unix - n n - - pipe
flags=O user=nobody argv=/usr/lib/postfix/mysql_alias_lookuptable
--lookuptable=/etc/postfix/mysql_virtual_alias_maps.cf sender=${sender}
recipient=${recipient}
---

In the perl-script but i do have
"alias" as "X-Original-To".

Only the pipe-flag F works, but I prefer "X-Original-To":

Received: from [192.168.0.104] (unknown [192.168.1.1])
by amnesix.t-p.com (Postfix) with ESMTP id C7A2D1140B5
for <b.schmidt>; Mon, 23 Jul 2007 10:46:15 +0200 (CEST)

As descripted in the thread (see above link), this scenario should work
without problems.

Does anyone know what I did wrong?

Thanks in advance,
Benjamin Schmidt