Open exim.conf and locate the TRANSPORTS section. You should find a default SMTP transport that looks like: <name>: driver = smtp
Edit this section to read: <name> driver = smtp hosts = smarthost.cc.ic.ac.uk hosts_override = true
Save the config file and restart Exim.
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 ...
Redirect root email to your full College email address: root:email@example.com