nixpkgs/nixos/modules/services/mail/mailman.xml

<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="module-services-mailman">
  <title>Mailman</title>
  <para>
    <link xlink:href="https://www.list.org">Mailman</link> is free
    software for managing electronic mail discussion and e-newsletter
    lists. Mailman and its web interface can be configured using the
    corresponding NixOS module. Note that this service is best used with
    an existing, securely configured Postfix setup, as it does not
    automatically configure this.
  </para>
  <section xml:id="module-services-mailman-basic-usage">
    <title>Basic usage with Postfix</title>
    <para>
      For a basic configuration with Postfix as the MTA, the following
      settings are suggested:
    </para>
    <programlisting>
{ config, ... }: {
  services.postfix = {
    enable = true;
    relayDomains = [&quot;hash:/var/lib/mailman/data/postfix_domains&quot;];
    sslCert = config.security.acme.certs.&quot;lists.example.org&quot;.directory + &quot;/full.pem&quot;;
    sslKey = config.security.acme.certs.&quot;lists.example.org&quot;.directory + &quot;/key.pem&quot;;
    config = {
      transport_maps = [&quot;hash:/var/lib/mailman/data/postfix_lmtp&quot;];
      local_recipient_maps = [&quot;hash:/var/lib/mailman/data/postfix_lmtp&quot;];
    };
  };
  services.mailman = {
    enable = true;
    serve.enable = true;
    hyperkitty.enable = true;
    webHosts = [&quot;lists.example.org&quot;];
    siteOwner = &quot;mailman@example.org&quot;;
  };
  services.nginx.virtualHosts.&quot;lists.example.org&quot;.enableACME = true;
  networking.firewall.allowedTCPPorts = [ 25 80 443 ];
}
</programlisting>
    <para>
      DNS records will also be required:
    </para>
    <itemizedlist spacing="compact">
      <listitem>
        <para>
          <literal>AAAA</literal> and <literal>A</literal> records
          pointing to the host in question, in order for browsers to be
          able to discover the address of the web server;
        </para>
      </listitem>
      <listitem>
        <para>
          An <literal>MX</literal> record pointing to a domain name at
          which the host is reachable, in order for other mail servers
          to be able to deliver emails to the mailing lists it hosts.
        </para>
      </listitem>
    </itemizedlist>
    <para>
      After this has been done and appropriate DNS records have been set
      up, the Postorius mailing list manager and the Hyperkitty archive
      browser will be available at https://lists.example.org/. Note that
      this setup is not sufficient to deliver emails to most email
      providers nor to avoid spam – a number of additional measures for
      authenticating incoming and outgoing mails, such as SPF, DMARC and
      DKIM are necessary, but outside the scope of the Mailman module.
    </para>
  </section>
  <section xml:id="module-services-mailman-other-mtas">
    <title>Using with other MTAs</title>
    <para>
      Mailman also supports other MTA, though with a little bit more
      configuration. For example, to use Mailman with Exim, you can use
      the following settings:
    </para>
    <programlisting>
{ config, ... }: {
  services = {
    mailman = {
      enable = true;
      siteOwner = &quot;mailman@example.org&quot;;
      enablePostfix = false;
      settings.mta = {
        incoming = &quot;mailman.mta.exim4.LMTP&quot;;
        outgoing = &quot;mailman.mta.deliver.deliver&quot;;
        lmtp_host = &quot;localhost&quot;;
        lmtp_port = &quot;8024&quot;;
        smtp_host = &quot;localhost&quot;;
        smtp_port = &quot;25&quot;;
        configuration = &quot;python:mailman.config.exim4&quot;;
      };
    };
    exim = {
      enable = true;
      # You can configure Exim in a separate file to reduce configuration.nix clutter
      config = builtins.readFile ./exim.conf;
    };
  };
}
</programlisting>
    <para>
      The exim config needs some special additions to work with Mailman.
      Currently NixOS can’t manage Exim config with such granularity.
      Please refer to
      <link xlink:href="https://mailman.readthedocs.io/en/latest/src/mailman/docs/mta.html">Mailman
      documentation</link> for more info on configuring Mailman for
      working with Exim.
    </para>
  </section>
</chapter>