I just recently install GitLab v5.0 on an Ubuntu 12.04 server and am now having issues with email notifications. I can\'t get GitLab to send any emails of any kind.
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On CentOS, this helped for me:
check your file /home/git/gitlab/config/environments/production.rb (if your running on production, wich is standard)
There you can change your sendmail settings. You should try to remove the -t parameter, wich fixed it for me! Some mailservers don't accept this parameter (check your maillog to be sure)
config.action_mailer.sendmail_settings = {
:location => '/usr/sbin/sendmail',
:arguments => '-i'
}