1. Open exim.conf and locate the TRANSPORTS section. You should find a default SMTP transport that looks like: <name>: driver = smtp
  2. Edit this section to read: <name> driver = smtp   hosts =  smarthost.cc.ic.ac.uk hosts_override = true
  3. Save the config file and restart Exim.
  4. Check that the machine can resolve smarthost.cc.ic.ac.uk. If it cannot, please check your DNS settings. Then edit the email aliases file (often /etc/aliases) and check that all system aliases redirect to root: postmaster: root mail: root daemon:  root ...
  5. Redirect root email to your full College email address: root: your.name@imperial.ac.uk