diff --git a/configs/nixos/ni/default.nix b/configs/nixos/ni/default.nix
index b98fb947..1926851d 100644
--- a/configs/nixos/ni/default.nix
+++ b/configs/nixos/ni/default.nix
@@ -19,6 +19,7 @@
     networking.enable = true;
     services.backup.enable = true;
     services.monitoring.enable = true;
+    services.mail-archive.enable = true;
     services.penpot.enable = true;
     services.reverse-proxy.enable = true;
     setups = {
diff --git a/configs/nixos/ni/modules/default.nix b/configs/nixos/ni/modules/default.nix
index b67caa27..b2b10c24 100644
--- a/configs/nixos/ni/modules/default.nix
+++ b/configs/nixos/ni/modules/default.nix
@@ -5,6 +5,7 @@
     ./networking/setup.nix
     ./networking/wireguard.nix
     ./services/backup
+    ./services/mail-archive.nix
     ./services/reverse-proxy.nix
     ./services/monitoring.nix
     ./services/download-media
diff --git a/configs/nixos/ni/modules/services/mail-archive.nix b/configs/nixos/ni/modules/services/mail-archive.nix
new file mode 100644
index 00000000..95abc9e2
--- /dev/null
+++ b/configs/nixos/ni/modules/services/mail-archive.nix
@@ -0,0 +1,89 @@
+{ config, lib, pkgs, ... }:
+
+let
+  hostCfg = config.hosts.ni;
+  cfg = hostCfg.services.mail-archive;
+
+  repos = {
+    guix-devel = {
+      description = "Guix development channel";
+      address = [ "guix-devel@gnu.org" ];
+      newsgroup = "inbox.comp.guix.devel";
+    };
+
+    systemd-devel = {
+      address = [ "systemd-devel@lists.freedesktop.org" ];
+      description = "systemd development channel";
+      newsgroup = "inbox.comp.systemd.devel";
+    };
+  };
+in
+{
+  options.hosts.ni.services.mail-archive.enable =
+    lib.mkEnableOption "preferred mail archiving service";
+
+  config = lib.mkIf cfg.enable {
+    state.ports.public-inbox-httpd.value = 23456;
+
+    services.public-inbox = {
+      enable = true;
+      http = {
+        enable = true;
+        port = "/run/public-inbox-http.sock";
+        mounts = [
+          "https://mail.ni.internal/inbox"
+        ];
+      };
+      imap.enable = true;
+      nntp.enable = true;
+
+      path = with pkgs; [ spamassassin ];
+
+      inboxes = lib.mapAttrs (n: v: {
+        inherit (v) description address newsgroup;
+        url = "http://mail.ni.internal/inbox/${n}";
+        coderepo = [ n ];
+      }) repos;
+
+      settings.coderepo = lib.mapAttrs (n: v: {
+        dir = "/var/lib/gitea/";
+        cgitUrl = "http://git.ni.internal/${n}.git";
+      }) repos;
+    };
+
+    services.nginx.virtualHosts."mail.ni.internal" = {
+      locations."/".return = "302 /inbox";
+      locations."= /inbox".return = "302 /inbox/";
+      locations."/inbox".proxyPass = "http://unix:${config.services.public-inbox.http.port}:/inbox";
+      locations."= /style/light.css".alias = pkgs.writeText "light.css" ''
+        * { background:#fff; color:#000 }
+
+        a { color:#00f; text-decoration:none }
+        a:visited { color:#808 }
+
+        *.q { color:#008 }
+
+        *.add { color:#060 }
+        *.del {color:#900 }
+        *.head { color:#000 }
+        *.hunk { color:#960 }
+
+        .hl.num { color:#f30 } /* number */
+        .hl.esc { color:#f0f } /* escape character */
+        .hl.str { color:#f30 } /* string */
+        .hl.ppc { color:#c3c } /* preprocessor */
+        .hl.pps { color:#f30 } /* preprocessor string */
+        .hl.slc { color:#099 } /* single-line comment */
+        .hl.com { color:#099 } /* multi-line comment */
+        /* .hl.opt { color:#ccc } */ /* operator */
+        /* .hl.ipl { color:#ccc } */ /* interpolation */
+
+        /* keyword groups kw[a-z] */
+        .hl.kwa { color:#f90 }
+        .hl.kwb { color:#060 }
+        .hl.kwc { color:#f90 }
+        /* .hl.kwd { color:#ccc } */
+      '';
+    };
+  };
+}