/home/git/gitlab/config/environments/production.rb

production.rb

  config.action_mailer.delivery_method = :smtp
  config.action_mailer.perform_deliveries = true
  config.action_mailer.raise_delivery_errors = true

  config.action_mailer.smtp_settings = {
      :address => 'smtp.gmail.comi',
      :port => 587,
      :domain => 'gmail.com',
      :authentication => 'plain',
      :user_name => '[email protected]',
      :password => 'password',
      :enable_starttls_auto => true
  }
  config.action_mailer.sendmail_settings = {
      #:location => '/usr/sbin/sendmail',
      :arguments =>  '-i'
  }