gitlab-ce/lib/gitlab/email/hook/disable_email_interceptor.rb

module Gitlab
  module Email
    module Hook
      class DisableEmailInterceptor
        def self.delivering_email(message)
          message.perform_deliveries = false

          Rails.logger.info "Emails disabled! Interceptor prevented sending mail #{message.subject}"
        end
      end
    end
  end
end