add mailserver

nixos/hosts/olympus/mailserver/configuration.nix

@@ -0,0 +1,30 @@
+# Edit this configuration file to define what should be installed on
+# your system.  Help is available in the configuration.nix(5) man page
+# and in the NixOS manual (accessible by running ‘nixos-help’).
+
+{ config, pkgs, ... }:
+
+{
+  imports = [ ];
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "22.11"; # Did you read the comment?
+
+  # Additional packages
+  environment.systemPackages = with pkgs; [ ];
+
+  networking.firewall.allowedTCPPorts = [ ];
+
+  mailserver = {
+    enable = false;
+    fqdn = "mail.0x76.dev";
+    domains = [ "0x76.dev" ];
+
+    certificateScheme = 3;
+  };
+}