{mailserver, ...}: let
  domain = "sondell.org";
  fqdn = "mail.${domain}";
  mailDirectory = "/var/vmail";
  dkimKeyDirectory = "/var/dkim";
in {
  imports = [
    mailserver
  ];

  services.restic.backups = {
    "mail" = {
      passwordFile = "/etc/nixos/.secrets/restic_pw";
      repository = "sftp:Glenn@nas:/home/back/mail/restic";
      initialize = true;
      paths = [
        mailDirectory
        # dkimKeyDirectory
      ];
      user = "root";
      timerConfig.OnCalendar = "02:05";
      pruneOpts = [
        "--keep-daily 10"
        "--keep-weekly 5"
        "--keep-monthly 12"
        "--keep-yearly 75"
      ];
    };
  };

  mailserver = {
    enable = true;
    inherit mailDirectory dkimKeyDirectory;
    fqdn = fqdn;
    domains = [domain];
    vmailGroupName = "backup";

    # A list of all login accounts. To create the password hashes, use
    # cat .secrets/nextadminpw | nix-shell -p mkpasswd --run 'mkpasswd -sm bcrypt' > .secrets/mailpw.hash
    # echo apassword | nix-shell -p mkpasswd --run 'mkpasswd -sm bcrypt' > .secrets/gilbertmailpw.hash
    loginAccounts = {
      "admin@sondell.org" = {
        hashedPasswordFile = "/etc/nixos/.secrets/mailpw.hash";
        aliases = ["info@sondell.org"];
      };
      "glenn@sondell.org" = {
        hashedPasswordFile = "/etc/nixos/.secrets/mailpw.hash";
      };
      "gilbert@sondell.org" = {
        hashedPasswordFile = "/etc/nixos/.secrets/gilbertmailpw.hash";
      };
    };

    # Use Let's Encrypt certificates. Note that this needs to set up a stripped
    # down nginx and opens port 80.
    certificateScheme = "acme-nginx";
  };

  services.roundcube = {
    enable = true;
    # this is the url of the vhost, not necessarily the same as the fqdn of
    # the mailserver
    hostName = "webmail.${domain}";
    extraConfig = ''
      # starttls needed for authentication, so the fqdn required to match
      # the certificate
      $config['smtp_server'] = "tls://${fqdn}";
      $config['smtp_user'] = "%u";
      $config['smtp_pass'] = "%p";
    '';
  };
}