diff --git a/addons/mail_plugin/controllers/mail_plugin.py b/addons/mail_plugin/controllers/mail_plugin.py
index a163a4a4edc..909b3e6a2f2 100644
--- a/addons/mail_plugin/controllers/mail_plugin.py
+++ b/addons/mail_plugin/controllers/mail_plugin.py
@@ -5,6 +5,7 @@ import base64
 import json
 import logging
 import requests
+from markupsafe import Markup
 from werkzeug.exceptions import Forbidden
 
 from odoo import http, tools, _
@@ -250,7 +251,7 @@ class MailPluginController(http.Controller):
                 for name, content in attachments
             ]
 
-        request.env[model].browse(res_id).message_post(body=message, attachments=attachments)
+        request.env[model].browse(res_id).message_post(body=Markup(message), attachments=attachments)
         return True
 
     @http.route('/mail_plugin/get_translations', type="json", auth="outlook", cors="*")