diff --git a/source/app/controllers/main.py b/source/app/controllers/main.py
index 5952af9..a511f5b 100644
--- a/source/app/controllers/main.py
+++ b/source/app/controllers/main.py
@@ -47,6 +47,7 @@ class AppLogin(object):
         session.invalidate()
         values = req.params
         values['rfc'] = values['rfc'].upper()
+        values['ip'] = req.remote_addr
         result, user = self._db.authenticate(values)
         if result['login']:
             session.save()
diff --git a/source/app/controllers/utils.py b/source/app/controllers/utils.py
index 5e2c779..8332596 100644
--- a/source/app/controllers/utils.py
+++ b/source/app/controllers/utils.py
@@ -18,12 +18,130 @@
 
 import base64
 import math
+import smtplib
 
+from email.mime.multipart import MIMEMultipart
+from email.mime.base import MIMEBase
+from email.mime.text import MIMEText
+from email import encoders
+from email.utils import formatdate
+
+import requests
 from cryptography.fernet import Fernet
 from cryptography.hazmat.backends import default_backend
 from cryptography.hazmat.primitives import hashes
 
 
+TIMEOUT = 10
+
+
+class SendMail(object):
+
+    def __init__(self, config):
+        self._config = config
+        self._server = None
+        self._error = ''
+        self._is_connect = self._login()
+
+    @property
+    def is_connect(self):
+        return self._is_connect
+
+    @property
+    def error(self):
+        return self._error
+
+    def _login(self):
+        hosts = ('gmail' in self._config['server'] or
+                'outlook' in self._config['server'])
+        try:
+            if self._config['ssl'] and hosts:
+                self._server = smtplib.SMTP(
+                    self._config['server'],
+                    self._config['port'], timeout=TIMEOUT)
+                self._server.ehlo()
+                self._server.starttls()
+                self._server.ehlo()
+            elif self._config['ssl']:
+                self._server = smtplib.SMTP_SSL(
+                    self._config['server'],
+                    self._config['port'], timeout=TIMEOUT)
+                self._server.ehlo()
+            else:
+                self._server = smtplib.SMTP(
+                    self._config['server'],
+                    self._config['port'], timeout=TIMEOUT)
+            self._server.login(self._config['user'], self._config['pass'])
+            return True
+        except smtplib.SMTPAuthenticationError as e:
+            if '535' in str(e):
+                self._error = 'Nombre de usuario o contraseña inválidos'
+                return False
+            # ~ print (e)
+            if '534' in str(e) and 'gmail' in self._config['server']:
+                self._error = 'Necesitas activar el acceso a otras ' \
+                    'aplicaciones en tu cuenta de GMail'
+                return False
+        except smtplib.SMTPException as e:
+            self._error = str(e)
+            return False
+        except Exception as e:
+            self._error = str(e)
+            return False
+        return
+
+    def send(self, options):
+        try:
+            message = MIMEMultipart()
+            message['From'] = self._config['user']
+            message['To'] = options['to']
+            message['CC'] = options.get('copy', '')
+            message['Subject'] = options['subject']
+            message['Date'] = formatdate(localtime=True)
+            if options.get('confirm', False):
+                message['Disposition-Notification-To'] = message['From']
+            message.attach(MIMEText(options['message'], 'html'))
+            for f in options.get('files', ()):
+                part = MIMEBase('application', 'octet-stream')
+                if isinstance(f[0], str):
+                    part.set_payload(f[0].encode('utf-8'))
+                else:
+                    part.set_payload(f[0])
+                encoders.encode_base64(part)
+                part.add_header(
+                    'Content-Disposition',
+                    "attachment; filename={}".format(f[1]))
+                message.attach(part)
+
+            receivers = options['to'].split(',') + message['CC'].split(',')
+            self._server.sendmail(
+                self._config['user'], receivers, message.as_string())
+            return ''
+        except Exception as e:
+            return str(e)
+
+    def close(self):
+        try:
+            self._server.quit()
+        except:
+            pass
+        return
+
+
+def send_mail(data):
+    msg = ''
+    ok = True
+    server = SendMail(data['server'])
+    if server.is_connect:
+        msg = server.send(data['mail'])
+    else:
+        msg = server.error
+        ok = False
+    server.close()
+
+    return {'ok': ok, 'msg': msg}
+
+
 def round_up(value):
     return int(math.ceil(value))
 
@@ -45,3 +163,10 @@ def decrypt(data, password):
     return f.decrypt(data.encode()).decode()
 
 
+def to_bool(value):
+    return bool(int(value))
+
+
+def get_url(url):
+    r = requests.get(url).text
+    return r
diff --git a/source/app/models/main.py b/source/app/models/main.py
index bd34878..f0e47e9 100644
--- a/source/app/models/main.py
+++ b/source/app/models/main.py
@@ -460,6 +460,17 @@ class Configuracion(BaseModel):
         values = {r.clave: r.valor for r in data}
         return values
 
+    def _get_admin_config_users(self):
+        fields = (
+            'chk_users_notify_access',
+        )
+        data = (Configuracion
+            .select()
+            .where(Configuracion.clave.in_(fields))
+        )
+        values = {r.clave: util.get_bool(r.valor) for r in data}
+        return values
+
     @classmethod
     def get_(cls, keys):
         if isinstance(keys, str):
@@ -477,6 +488,7 @@ class Configuracion(BaseModel):
             'complements',
             'folios',
             'correo',
+            'admin_config_users',
         )
         opt = keys['fields']
         if opt in options:
@@ -8570,6 +8582,50 @@ def _save_log(user, action, table):
     return
 
 
+@util.run_in_thread
+def _send_notify_access(args):
+    admins = (Usuarios
+        .select(Usuarios.correo)
+        .where(Usuarios.es_admin==True)
+        .scalar(as_tuple=True))
+
+    if not admins:
+        return
+
+    config = Configuracion.get_({'fields': 'correo'})
+    contra = Configuracion.get_('correo_contra')
+    if not config:
+        return
+
+    user = args['usuario']
+    rfc = args['rfc']
+    ip = args['ip']
+
+    url = f"http://ip-api.com/line/{ip}?fields=city"
+    city = utils.get_url(url)
+    message = f"Desde la IP: {ip} en: {city}"
+
+    server = {
+        'server': config['correo_servidor'],
+        'port': config['correo_puerto'],
+        'ssl': utils.to_bool(config['correo_ssl']),
+        'user': config['correo_usuario'],
+        'pass': utils.decrypt(contra, rfc),
+    }
+    mail = {
+        'to': ','.join(admins),
+        'subject': f"Usuario {user} identificado",
+        'message': message,
+    }
+    data= {
+        'server': server,
+        'mail': mail,
+    }
+    result = utils.send_mail(data)
+
+    return
+
+
 def authenticate(args):
     respuesta = {'login': False, 'msg': 'No Autorizado', 'user': ''}
     values = util.get_con(args['rfc'])
@@ -8594,7 +8650,11 @@ def authenticate(args):
     respuesta['login'] = True
     respuesta['user'] = str(obj)
     respuesta['super'] = obj.es_superusuario
-    #~ respuesta['admin'] = obj.es_superusuario or obj.es_admin
+
+    notify_access = Configuracion.get_bool('chk_users_notify_access')
+    if notify_access:
+       _send_notify_access(args)
+
     return respuesta, obj
 
 
diff --git a/source/static/js/controller/admin.js b/source/static/js/controller/admin.js
index af868bc..d533bdc 100644
--- a/source/static/js/controller/admin.js
+++ b/source/static/js/controller/admin.js
@@ -59,11 +59,13 @@ var controllers = {
         $$('grid_admin_unidades').attachEvent('onItemClick', grid_admin_unidades_click)
         $$('grid_moneda_found').attachEvent('onValueSuggest', grid_moneda_found_click)
         $$('cmd_agregar_impuesto').attachEvent('onItemClick', cmd_agregar_impuesto_click)
+
         //~ Usuarios
         $$('cmd_usuario_agregar').attachEvent('onItemClick', cmd_usuario_agregar_click)
         $$('grid_usuarios').attachEvent('onItemClick', grid_usuarios_click)
         $$('grid_usuarios').attachEvent('onCheck', grid_usuarios_on_check)
         $$('grid_usuarios').attachEvent('onItemDblClick', grid_usuarios_double_click)
+        $$('chk_users_notify_access').attachEvent('onItemClick', chk_config_item_click)
         admin_ui_windows.init()
 
         //~ Opciones
@@ -408,9 +410,22 @@ function get_admin_usos_cfdi(){
 
 function get_admin_usuarios(){
     webix.ajax().sync().get('/values/allusuarios', function(text, data){
-        var values = data.json()
+        var rows = data.json()
         $$('grid_usuarios').clearAll()
-        $$('grid_usuarios').parse(values, 'json')
+        $$('grid_usuarios').parse(rows)
+    })
+
+    webix.ajax().get('/config', {'fields': 'admin_config_users'}, {
+        error: function(text, data, xhr) {
+            msg = 'Error al consultar'
+            msg_error(msg)
+        },
+        success: function(text, data, xhr) {
+            var values = data.json()
+            Object.keys(values).forEach(function(key){
+                $$(key).setValue(values[key])
+            })
+        }
     })
 }
 
@@ -447,7 +462,6 @@ function get_config_values(opt){
         },
         success: function(text, data, xhr) {
             var values = data.json()
-            //~ showvar(values)
             Object.keys(values).forEach(function(key){
                 $$(key).setValue(values[key])
             })
diff --git a/source/static/js/ui/admin.js b/source/static/js/ui/admin.js
index d864799..405e968 100644
--- a/source/static/js/ui/admin.js
+++ b/source/static/js/ui/admin.js
@@ -1219,6 +1219,10 @@ var usuarios_admin = [
     {maxHeight: 20},
     {template: 'Usuarios Registrados', type: 'section'},
     {cols: [{maxWidth: 10}, grid_usuarios, {maxWidth: 10}]},
+    {maxHeight: 20},
+    {template: 'Opciones', type: 'section'},
+    {cols: [{view: 'checkbox', id: 'chk_users_notify_access', labelWidth: 15,
+        labelRight: 'Notificar accesos al sistema (solo a administradores)'}]},
     {},
 ]