Okay, so I just installed GitLab using the Omnibus edition on Ubuntu 14.04. I've got everything working, EXCEPT e-mail links and project URLs are using internal links (http://gitlab/). I've configured the external url parameter in /etc/gitlab/gitlab.rb, and I can't find any other settings to configure to possibly change this.
after you change de external url you must reconfigure gitlab with gitlab-ctl reconfigure