diff --git a/package-lock.json b/package-lock.json
index 5a08a42..f0eb4a1 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -24,6 +24,7 @@
         "mariadb": "^2.5.1",
         "moment": "^2.29.1",
         "multer": "^1.4.2",
+        "nodemailer": "^6.10.1",
         "sequelize": "^6.3.5",
         "validator": "^13.1.17"
       },
@@ -1994,9 +1995,10 @@
       }
     },
     "node_modules/nodemailer": {
-      "version": "6.7.2",
-      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.7.2.tgz",
-      "integrity": "sha512-Dz7zVwlef4k5R71fdmxwR8Q39fiboGbu3xgswkzGwczUfjp873rVxt1O46+Fh0j1ORnAC6L9+heI8uUpO6DT7Q==",
+      "version": "6.10.1",
+      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.10.1.tgz",
+      "integrity": "sha512-Z+iLaBGVaSjbIzQ4pX6XV41HrooLsQ10ZWPUehGmuantvzWoDVBnmsdUcOIDM1t+yPor5pDhVlDESgOMEGxhHA==",
+      "license": "MIT-0",
       "engines": {
         "node": ">=6.0.0"
       }
@@ -4525,9 +4527,9 @@
       "integrity": "sha512-Fcvtbb+zBcZXbTTVwqGA5W+MKBj56UjVRevvchv5XrcyXbmNdesfZL37nlcWOfpgHhgmxApw3tQbTr4CqNmX4w=="
     },
     "nodemailer": {
-      "version": "6.7.2",
-      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.7.2.tgz",
-      "integrity": "sha512-Dz7zVwlef4k5R71fdmxwR8Q39fiboGbu3xgswkzGwczUfjp873rVxt1O46+Fh0j1ORnAC6L9+heI8uUpO6DT7Q=="
+      "version": "6.10.1",
+      "resolved": "https://registry.npmjs.org/nodemailer/-/nodemailer-6.10.1.tgz",
+      "integrity": "sha512-Z+iLaBGVaSjbIzQ4pX6XV41HrooLsQ10ZWPUehGmuantvzWoDVBnmsdUcOIDM1t+yPor5pDhVlDESgOMEGxhHA=="
     },
     "nodemon": {
       "version": "2.0.15",
diff --git a/package.json b/package.json
index 9986364..6b322b9 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     "mariadb": "^2.5.1",
     "moment": "^2.29.1",
     "multer": "^1.4.2",
+    "nodemailer": "^6.10.1",
     "sequelize": "^6.3.5",
     "validator": "^13.1.17"
   },
diff --git a/server/helper/gmail.js b/server/helper/gmail.js
index cb60784..69a9198 100644
--- a/server/helper/gmail.js
+++ b/server/helper/gmail.js
@@ -1,4 +1,4 @@
-require('../config/config');
+/* require('../config/config');
 
 const send = require('gmail-send')({
   user: process.env.GMAIL,
@@ -21,3 +21,47 @@ const gmail = (subject, to, text) => {
 };
 
 module.exports = gmail;
+ */
+
+
+
+
+// src/utils/gmail.js  (o donde prefieras)
+// gmail.js  (o el nombre que prefieras)
+require('../config/config');           // mantiene tu carga de variables
+const nodemailer = require('nodemailer');
+
+// Transporter con pooling y throttling
+const transporter = nodemailer.createTransport({
+  host: 'smtp.gmail.com',              // cambia a smtp-relay.gmail.com si usas Workspace
+  port: 587,
+  secure: false,                       // STARTTLS en puerto 587
+  requireTLS: true,
+  auth: {
+    user: process.env.USER_GMAIL,      // ejemplo: tu-cuenta@gmail.com
+    pass: process.env.PASS_GMAIL,      // App-Password de 16 caracteres
+  },
+  pool: true,            // reutiliza la conexión
+  maxConnections: 1,     // una conexión simultánea
+  maxMessages: 100,      // reabre después de 100 envíos
+  rateDelta: 2000,       // ventana de 2 s
+  rateLimit: 1,          // máx. 1 mensaje por ventana (≈ 0.5 msg/s)
+});
+
+/**
+ * Envía un correo (API idéntica a tu versión anterior).
+ * @param {string} subject  Asunto
+ * @param {string|string[]} to  Destinatario(s)
+ * @param {string} text     Cuerpo en texto plano
+ * @return {Promise<object>} info de nodemailer
+ */
+const gmail = (subject, to, text) =>
+  transporter.sendMail({
+    from: process.env.USER_GMAIL,
+    to,
+    subject,
+    text,
+  });
+
+module.exports = gmail;
+