gistfile1.txt

cd /opt/gitlab/embedded/service/gitlab-rails
vim config/environments/production.rb

//====== 以下のように書き換える
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.smtp_settings = {
  :address              => "smtp.gmail.com",
  :port                 => 587,
  :domain               => 'gmail.com',
  :user_name            => 'Gmailのユーザー名',
  :password             => 'Gmailのパスワード',
  :authentication       =>  :plain,
  :enable_starttls_auto => true
  }