Add autodiscovery to the mailserver

modules/system/services/server/mailserver/go-autoconfig/default.nix

@@ -0,0 +1,20 @@
+{ config, ... }:
+{
+  imports = [ ./nginx ];
+
+  services.go-autoconfig = {
+    enable = config.system.mailserver.enable;
+    settings = {
+      service_addr = ":1323";
+      domain = "autoconfig.nixfox.ca";
+      imap = {
+        server = "mx.nixfox.ca";
+        port = 143;
+      };
+      smtp = {
+        server = "mx.nixfox.ca";
+        port = 587;
+      };
+    };
+  };
+}