Trouble with mailbox_transport=error:foo

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Trouble with mailbox_transport=error:foo
\ Ian Ward Comfort (14 May 2007)
. \ Ian Ward Comfort (14 May 2007)
. \ (Wietse Venema) (15 May 2007)
. . \ Ian Ward Comfort (15 May 2007)
. . . \ (Wietse Venema) (15 May 2007)
. . . . \ Ian Ward Comfort (15 May 2007)
. . . . . \ (Wietse Venema) (15 May 2007)
. . . . . . \ Ian Ward Comfort (15 May 2007)
. . \ (Wietse Venema) (15 May 2007)

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Subject:	Trouble with mailbox_transport=error:foo
Group:	Postfix-users
From:	Ian Ward Comfort
Date:	14 May 2007

I'm running Postfix 2.2.10 from a stock Red Hat RPM on RHEL4u4. I'd
like to disable delivery to local mailspools, while retaining local
alias (and .forward) functionality. A post from this list (dated 13
July 2001) suggests that this should work:

mailbox_transport = error:local mailbox delivery is disabled

However with my current configuration, mail is neither delivered to a
local spool nor bounced, as far as I can tell. I see only this in
the logs when I submit mail locally for a UNIX user ('echo foo |
sendmail -v icomfort' as root):

May 14 16:31:51 stucomp-prod postfix/pickup[22887]: E37DC20097: uid=0
from=<root>
May 14 16:31:51 stucomp-prod postfix/cleanup[22949]: E37DC20097:
message-id=<20070514233151.E37DC20097>
May 14 16:31:51 stucomp-prod postfix/qmgr[22888]: E37DC20097:
from=<root>, size=327, nrcpt=1 (queue active)
May 14 16:31:52 stucomp-prod postfix/qmgr[22888]: E37DC20097: removed

with no subsequent entries (this is a quiet test machine); the status
report says "--- Delivery report unavailable ---". A full delivery
report from a later attempt, and a log excerpt with qmgr, local,
error, and bounce all running with -v are posted here:

http://www.stanford.edu/~icomfort/delivery-report.txt
http://www.stanford.edu/~icomfort/maillog-excerpt.txt

And postconf -n output is below.

alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
fallback_relay = [smtp.stanford.edu]
inet_interfaces = loopback-only
mail_owner = postfix
mailbox_transport = error:delivery to mailboxes is disabled
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydomain = stanford.edu
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.2.10/README_FILES
sample_directory = /usr/share/doc/postfix-2.2.10/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtp_use_tls = yes
transport_maps = hash:/etc/postfix/transport

Any suggestions for further troubleshooting would be much appreciated.

---IWC