Install source

svn co https://socialtext.svn.sourceforge.net/svnroot/socialtext
cd socialtext
./configure --hostname saturn.ffzg.hr --server-admin dpavlin@rot13.org --support-address mglavica@ffzg.hr
make

Add new admin user

sudo -u www-data st-admin create-user --email dpavlin@rot13.org --password wikidream --first-name Dobrica --last-name Pavlinusic
sudo -u www-data st-admin add-workspace-admin --email dpavlin@rot13.org

Configuring mailer

Execute commands as root to install masqmail and configure mail routing

apt-get install masqmail
echo mjesec.ffzg.hr > /etc/masqmail/mjesec.route
echo mjesec > /var/run/masqmail-route
vi /etc/masqmail/masqmail.conf

Add following to end of file:

online_routes.mjesec=/etc/masqmail/mjesec.route
local_hosts=localhost;saturn;saturn.ffzg.hr
listen_addresses=localhost:25;saturn.ffzg.hr:25
alias_file=/etc/aliases.deliver

Then again as root

/etc/init.d/masqmail restart

You may want to add all addresses from /etc/alaiases to /etc/aliases.deliver (like root, postmaster and so on...)