problem to send a mail to a command in aliases

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problem to send a mail to a command in aliases
\ Sebastian Reitenbach (11 Apr 2007)
. \ (Wietse Venema) (11 Apr 2007)

3 msg	smtpd_auth

Subject:	problem to send a mail to a command in aliases
Group:	Postfix-users
From:	Sebastian Reitenbach
Date:	11 Apr 2007

Hi all,

I am trying to setup an alias that is sending the mail to a command like
this:

comment: "|/opt/rt3/bin/rt-mailgate --queue general --action comment --url
https://rt.mysrv.intern"

in the aliases file I have it all on one line. man aliases says the command
has to be in "", if it has parameters, but when I send a message to the
comment mail address, I see the following in the mail logs:
Apr 11 12:34:27 myserver postfix/local[20387]: 86C8A8BF20:
to=<general-reply>,
orig_to=<general-reply@localhost>, relay=local, delay=0, status=bounced
(Command died with status 127: "/opt/rt3/bin/rt-mailgate --queue
general --action comment --url https://rt.mysrv.intern". Command
output: /bin/sh: /opt/rt3/bin/rt-mailgate --queue general --action
comment --url https://rt.mysrv.intern: No such file or directory )

so it seems to interpret the whole string as one command, but without the
parenthese around it or with single parentheses ' ', it is not working too.

so I tried to wrap a shell script around it like this one:

#!/bin/sh

cat /dev/stdin > /tmp/blah

cat /tmp/blah |/opt/rt3/bin/rt-mailgate --queue general --action
comment --url https://rt.mysrv.intern

it works well on the command line, but when spawned from postfix, the
file /tmp/blah is empty.

I also haven't touched the allow_mail_to_commands:
allow_mail_to_commands = alias, forward

what am I missing, doing wrong?

btw, I have postfix-2.2.9-10 rpm installed on suse 10.1

kind regards
Sebastian