diff --git a/addons/mail/models/mail_render_mixin.py b/addons/mail/models/mail_render_mixin.py
index 02e157674d130..27eec61461836 100644
--- a/addons/mail/models/mail_render_mixin.py
+++ b/addons/mail/models/mail_render_mixin.py
@@ -162,7 +162,14 @@ def _sub_relative2absolute(match):
         _sub_relative2absolute.base_url = base_url
         html = re.sub(r"""(<img(?=\s)[^>]*\ssrc=")(/[^/][^"]+)""", _sub_relative2absolute, html)
         html = re.sub(r"""(<a(?=\s)[^>]*\shref=")(/[^/][^"]+)""", _sub_relative2absolute, html)
-        html = re.sub(r"""(<[^>]+\bstyle="[^"]+\burl\('?)(/[^/'][^'")]+)""", _sub_relative2absolute, html)
+        html = re.sub(re.compile(
+            r"""( # Group 1: element up to url in style
+                <[^>]+\bstyle=" # Element with a style attribute
+                [^"]+\burl\( # Style attribute contains "url(" style
+                (?:&\#34;|')?) # url style may start with (escaped) quote: capture it
+            ( # Group 2: url itself
+                /(?:[^'")]|(?!&\#34;))+ # stop at the first closing quote
+        )""", re.VERBOSE), _sub_relative2absolute, html)
 
         return wrapper(html)
 
diff --git a/addons/mail/tests/test_mail_render.py b/addons/mail/tests/test_mail_render.py
index 9f97ff6d676d8..4d13d47ec9fe3 100644
--- a/addons/mail/tests/test_mail_render.py
+++ b/addons/mail/tests/test_mail_render.py
@@ -221,7 +221,7 @@ def test_render_template_local_links(self):
         rendered_local_links = [
             '<div style="background-image:url(%s/web/path?a=a&b=b);"/>' % base_url,
             '<div style="background-image:url(\'%s/web/path?a=a&b=b\');"/>' % base_url,
-            '<div style="background-image:url(&#34;/web/path?a=a&b=b&#34;);"/>'
+            '<div style="background-image:url(&#34;%s/web/path?a=a&b=b&#34;);"/>' % base_url
         ]
         for source, expected in zip(local_links_template_bits, rendered_local_links):
             rendered = self.env['mail.render.mixin']._replace_local_links(source)