<section>
    <title>Email Notifications</title>
    <para>
      Hydra can send email notifications when the status of a build changes. This provides
      immediate feedback to maintainers or committers when a change causes build failures.
    </para>
    <para>
      The simplest approach to enable Email Notifications is to use the ssmtp package, which
      simply hands off the emails to another SMTP server. For details on how to configure ssmtp,
      see the documentation for the <varname>networking.defaultMailServer</varname> option.
      To use ssmtp for the Hydra email notifications, add it to the path option of the Hydra services
      in your <filename>/etc/nixos/configuration.nix</filename> file:
<programlisting>
systemd.services.hydra-queue-runner.path = [ pkgs.ssmtp ];
systemd.services.hydra-server.path = [ pkgs.ssmtp ];
</programlisting>
    </para>
  </section>