feat: setup email notification on systemd failures

services/mail.nix

@@ -0,0 +1,22 @@
+{ config, pkgs, ... }:
+
+{
+  programs.msmtp = {
+    enable = true;
+    defaults = {
+      tls = true;
+      tls_starttls = true;
+      auth = true;
+    };
+    accounts.default = rec {
+      tls = true;
+      tls_starttls = true;
+      host = "smtp.web.de";
+      port = 587;
+      user = "felschr@web.de";
+      passwordeval = "cat /etc/nixos/secrets/smtp";
+      # from = "%U@server.felschr.com";
+      from = user;
+    };
+  };
+}