HOWTO use system_aliases exim4

[Jeffrey Chimene <jeff@grandadventuresranch.com>]

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Hi:

I'm trying to get exim4 to use the /etc/aliases file. I want to send
email addressed to root and postmaster to my smarthost.

For example, logcheck and cron-apt are failing when sending mail.

This used to work just fine under exim3

Address rewriting in /etc/email-addresses doesn't rewrite the TO
address. This is verified using exim -brw root
fred:/etc/exim4# exim -brw root
  sender: root@fred
    from: root@fred
      to: root@fred
      cc: root@fred
     bcc: root@fred
reply-to: root@fred
env-from: root@fred
  env-to: root@fred

I have /etc/aliases correct (from exim3 days), but the file isn't used:
the system_aliases tag/target/whatever doesn't get read.

The exim site has no entry in its index for this tag/target/wtf Is this
created by Debian or is it part of standard exim4?

How do I use /etc/aliases?

FWIW, I've already seen the following thread:
http://www.exim.org/mail-archives/exim-users/Week-of-Mon-20050523/msg00247.html

Here are the current values from update-exim4.conf.conf:
dc_eximconfig_configtype='satellite'
dc_other_hostnames='fred'
dc_local_interfaces='127.0.0.1'
dc_readhost='fubar.com'
dc_relay_domains=''
dc_minimaldns='false'
dc_relay_nets=''
dc_smarthost='mail.mysite.com'
CFILEMODE='644'
dc_use_split_config='false'
dc_hide_mailname='true'
dc_mailname_in_oh='true'
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