phlyMail offers you an interface in the browser to have access to your emails, contacts, appointments, tasks, files and bookmakrs from anyhwere, where you have internet access. This can be your home, workplace, train station, abroad, offroad, in the woods or your own backyard.
Input passed via the 'go' parameter in 'derefer.php' script is not properly verified before being used to redirect users. This can be exploited to redirect a user to an arbitrary website e.g. when a user clicks a specially crafted link to the affected script hosted on a trusted domain.