diff --git a/tests/start_test.py b/tests/start_test.py
index 30ce2ec..0c0068b 100755
--- a/tests/start_test.py
+++ b/tests/start_test.py
@@ -181,10 +181,27 @@ def start_tests(test_dir, maildir, smtp_port):
         print(f"{nb_failed} {msg} failed the DKIM signature test")
 
 
+def get_maildir():
+    maildir = tempfile.TemporaryDirectory(prefix="Maildir_")
+    flags = (
+        stat.S_IRUSR
+        | stat.S_IWUSR
+        | stat.S_IXUSR
+        | stat.S_IRGRP
+        | stat.S_IWGRP
+        | stat.S_IXGRP
+        | stat.S_IROTH
+        | stat.S_IWOTH
+        | stat.S_IXOTH
+    )
+    os.chmod(maildir.name, flags)
+    return maildir
+
+
 def main():
     test_dir = pathlib.Path(__file__).parent.resolve()
     os.chdir(test_dir.parent)
-    maildir = tempfile.TemporaryDirectory(prefix="Maildir_")
+    maildir = get_maildir()
     start_tests(test_dir, maildir, DEFAULT_PORT)