Enable e-mail services for auto-upgrade

options/email.nix

@@ -1,7 +1,11 @@
 { config, lib, ... }:
 with lib;
+let
+    cfg = config.email;
+in
 {
     options.email = {
+        enable = lib.mkEnableOption "Allow sending system status e-mails via sendmail";
         fromAddress = mkOption {
             type = types.str;
             example = "noreply@example.com";
@@ -25,4 +29,21 @@ with lib;
             '';
         };
     };
+
+    config.programs.msmtp = lib.mkIf cfg.enable {
+        enable = true;
+        setSendmail = true;
+        accounts = {
+            default = {
+                auth = true;
+                host = "gvfr.de";
+                passwordeval = "cat /secrets/email_password.txt";
+                user = cfg.fromAddress;
+                from = cfg.fromAddress;
+                port = 465;
+                tls = true;
+                tls_starttls = false;
+            };
+        };
+    };
 }