+# Set up mail system.
+su plom -c 'mkdir -p /home/plom/mail/'
+su plom -c 'mkdir -p /home/plom/mail/inbox/{cur,new,tmp}'
+su plom -c 'mkdir -p /home/plom/mail/new_inbox/{cur,new,tmp}'
+DEBIAN_FRONTEND=noninteractive apt-get -y install getmail4 procmail mutt postfix maildrop
+cp config/systemfiles/main.cf /etc/postfix/main.cf
+cp config/systemfiles/aliases /etc/aliases
+newaliases
+service postfix restart
+
+# Set up regular system update reminder.
+apt-get -y install cron
+su plom -c "echo '0 0 * * 0 ~/config/bin/simplemail.sh ~/config/mails/update_reminder' | crontab -"
+
+# Set up screen.
+apt-get -y install screen
+
+# Set up ping.
+apt-get -y install iputils-ping
+
+# Set up irssi.
+apt-get -y install irssi
+cp config/systemfiles/irssi.service /etc/systemd/system/irssi.service
+systemctl enable /etc/systemd/system/irssi.service
+