diff --git a/odoo/addons/base/tests/test_mail.py b/odoo/addons/base/tests/test_mail.py
index 97d6a3fe39c..ca2a3a3b054 100644
--- a/odoo/addons/base/tests/test_mail.py
+++ b/odoo/addons/base/tests/test_mail.py
@@ -414,6 +414,7 @@ class TestHtmlTools(BaseCase):
             self.assertTrue(is_html_empty(content))
 
         void_html_samples = [
+            '<section><br /> <b><i/></b></section>',
             '<p><br></p>', '<p><br> </p>', '<p><br /></p >',
             '<p style="margin: 4px"></p>',
             '<div style="margin: 4px"></div>',
diff --git a/odoo/tools/mail.py b/odoo/tools/mail.py
index 19485809702..45b5400c2a1 100644
--- a/odoo/tools/mail.py
+++ b/odoo/tools/mail.py
@@ -315,7 +315,7 @@ def is_html_empty(html_content):
     """
     if not html_content:
         return True
-    tag_re = re.compile(r'\<\s*\/?(?:p|div|span|br|b|i|font)(?:(?=\s+\w*)[^/>]*|\s*)/?\s*\>')
+    tag_re = re.compile(r'\<\s*\/?(?:p|div|section|span|br|b|i|font)(?:(?=\s+\w*)[^/>]*|\s*)/?\s*\>')
     return not bool(re.sub(tag_re, '', html_content).strip())
 
 def html_keep_url(text):