diff --git a/tests/app/test_mails.py b/tests/app/test_mails.py
index f03f45a1..bd10697e 100644
--- a/tests/app/test_mails.py
+++ b/tests/app/test_mails.py
@@ -199,6 +199,19 @@ def test_default_from_addr(testclient, user, smtpd):
     assert smtpd.messages[0]["From"] == '"Canaille" <admin@localhost>'
 
 
+def test_default_with_no_flask_server_name(configuration, user, smtpd, backend):
+    del configuration["SERVER_NAME"]
+    del configuration["SMTP"]["FROM_ADDR"]
+    app = create_app(configuration, backend=backend)
+
+    testclient = TestApp(app)
+    res = testclient.get("/reset", status=200)
+    res.form["login"] = "user"
+    res = res.form.submit(status=200)
+    assert smtpd.messages[0]["X-MailFrom"] == "admin@localhost"
+    assert smtpd.messages[0]["From"] == '"Canaille" <admin@localhost>'
+
+
 def test_default_from_flask_server_name(configuration, user, smtpd, backend):
     app = create_app(configuration, backend=backend)
     del app.config["SMTP"]["FROM_ADDR"]