diff --git a/tests/test_utils_sendmail.py b/tests/test_utils_sendmail.py
index ae016c29..4a4d30f5 100644
--- a/tests/test_utils_sendmail.py
+++ b/tests/test_utils_sendmail.py
@@ -50,6 +50,13 @@ def test_sendmail_local_delivery():
     assert subject in content, "Email subject not found in delivered message"
     assert body in content, "Email body not found in delivered message"
 
+    repr_str = repr(msg)
+    assert isinstance(repr_str, str), "__repr__() must return str"
+    assert f"To: {to_addr}" in repr_str, "To header missing from __repr__()"
+    assert f"From: {from_addr}" in repr_str, "From header missing from __repr__()"
+    assert f"Subject: {subject}" in repr_str, "Subject header missing from __repr__()"
+    assert body in repr_str, "Body missing from __repr__()"
+
 def test_sendmail_raises_on_sendmail_failure(monkeypatch):
     # Fake CompletedProcess-like object with a failing return code
     class FakeResult: