Add more generic SMTP options

package.json

@@ -16,6 +16,7 @@
     "@monaco-editor/react": "^4.7.0",
     "@tanstack/react-query": "^5.90.21",
     "@tanstack/react-table": "^8.21.3",
+    "@types/nodemailer": "^7.0.11",
     "@xterm/addon-fit": "^0.11.0",
     "@xterm/addon-search": "^0.16.0",
     "@xterm/addon-web-links": "^0.12.0",
@@ -34,12 +35,12 @@
     "next-safe-action": "^8.1.8",
     "next-themes": "^0.4.6",
     "node-cron": "^4.2.1",
+    "nodemailer": "^8.0.1",
     "rcon-client": "^4.2.5",
     "react": "19.2.3",
     "react-dom": "19.2.3",
     "react-dropzone": "^15.0.0",
     "recharts": "^3.8.0",
-    "resend": "^6.9.3",
     "semver": "^7.7.4",
     "shadcn": "^4.0.2",
     "socket.io": "^4.8.3",