diff --git a/CHANGES.rst b/CHANGES.rst
index bbfad1356..b71fd0986 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -8,6 +8,7 @@ Unreleased
 -   Use modern packaging metadata with ``pyproject.toml`` instead of ``setup.cfg``.
     :pr:`1793`
 -   Use ``flit_core`` instead of ``setuptools`` as build backend.
+-   Don't ``mailto:``-``urlize()`` addresses in the form ``@a@b``. :pr:`1870`
 
 
 Version 3.1.3
diff --git a/src/jinja2/utils.py b/src/jinja2/utils.py
index 4b4720f6d..78eb5bdfe 100644
--- a/src/jinja2/utils.py
+++ b/src/jinja2/utils.py
@@ -324,6 +324,7 @@ def trim_url(x: str) -> str:
         elif (
             "@" in middle
             and not middle.startswith("www.")
+            and not middle.startswith("@")
             and ":" not in middle
             and _email_re.match(middle)
         ):
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 7b58af144..11f76c2eb 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -141,6 +141,14 @@ def test_escape_urlize_target(self):
             "http://example.org</a>"
         )
 
+    def test_urlize_mail_mastodon(self):
+        fr = "nabijaczleweli@nabijaczleweli.xyz\n@eater@cijber.social\n"
+        to = (
+            '<a href="mailto:nabijaczleweli@nabijaczleweli.xyz">'
+            "nabijaczleweli@nabijaczleweli.xyz</a>\n@eater@cijber.social\n"
+        )
+        assert urlize(fr) == to
+
 
 class TestLoremIpsum:
     def test_lorem_ipsum_markup(self):