diff --git a/addons/mail/models/mail_thread.py b/addons/mail/models/mail_thread.py
index 9a2f815fe71..a5c564defe3 100644
--- a/addons/mail/models/mail_thread.py
+++ b/addons/mail/models/mail_thread.py
@@ -1954,6 +1954,41 @@ class MailThread(models.AbstractModel):
             composer.write(update_values)
         return composer.send_mail()
 
+    def _message_log(self, body='', subject=False, message_type='notification', **kwargs):
+        """ Shortcut allowing to post note on a document. It does not perform
+        any notification and pre-computes some values to have a short code
+        as optimized as possible. This method is private as it does not check
+        access rights and perform the message creation as sudo to speedup
+        the log process. This method should be called within methods where
+        access rights are already granted to avoid privilege escalation. """
+        if len(self.ids) > 1:
+            raise exceptions.Warning(_('Invalid record set: should be called as model (without records) or on single-record recordset'))
+
+        kw_author = kwargs.pop('author_id', False)
+        if kw_author:
+            author = self.env['res.partner'].sudo().browse(kw_author)
+            email_from = formataddr((author.name, author.email))
+        else:
+            author = self.env.user.partner_id
+            email_from = formataddr((author.name, author.email))
+
+        message_values = {
+            'subject': subject,
+            'body': body,
+            'author_id': author.id,
+            'email_from': email_from,
+            'message_type': message_type,
+            'model': kwargs.get('model', self._name),
+            'res_id': self.ids[0] if self.ids else False,
+            'subtype_id': self.env.ref('mail.mt_note').id,
+            'record_name': False,
+            'reply_to': self.env['mail.thread'].sudo()._notify_get_reply_to([0])[0],
+            'message_id': tools.generate_tracking_message_id('message-notify'),
+        }
+        message_values.update(kwargs)
+        message = self.env['mail.message'].sudo().create(message_values)
+        return message
+
     # ------------------------------------------------------
     # Followers API
     # ------------------------------------------------------
diff --git a/addons/test_mail/tests/test_message_compose.py b/addons/test_mail/tests/test_message_compose.py
index 6c561bab89d..e2668cdac45 100644
--- a/addons/test_mail/tests/test_message_compose.py
+++ b/addons/test_mail/tests/test_message_compose.py
@@ -3,6 +3,7 @@
 
 import base64
 
+from email.utils import formataddr
 from unittest.mock import patch
 
 from odoo.addons.test_mail.tests.common import BaseFunctionalTest, MockEmails, TestRecipients
@@ -200,6 +201,17 @@ class TestMessagePost(BaseFunctionalTest, MockEmails, TestRecipients):
         self.assertEqual(reply.needaction_partner_ids, self.user_employee.partner_id)
         self.assertEqual(reply.parent_id, msg)
 
+    def test_post_log(self):
+        new_note = self.test_record.sudo(self.user_employee)._message_log(
+            body='<p>Labrador</p>',
+        )
+
+        self.assertEqual(new_note.subtype_id, self.env.ref('mail.mt_note'))
+        self.assertEqual(new_note.body, '<p>Labrador</p>')
+        self.assertEqual(new_note.author_id, self.user_employee.partner_id)
+        self.assertEqual(new_note.email_from, formataddr((self.user_employee.name, self.user_employee.email)))
+        self.assertEqual(new_note.needaction_partner_ids, self.env['res.partner'])
+
 
 class TestComposer(BaseFunctionalTest, MockEmails, TestRecipients):