diff --git a/src/daemon/dispatcher.py b/src/daemon/dispatcher.py
index 5f2b47e..cf5b1f3 100644
--- a/src/daemon/dispatcher.py
+++ b/src/daemon/dispatcher.py
@@ -465,7 +465,9 @@ class Dispatcher:
                         "session_id": None, "status": "error",
                         "reason": "No spawner configured"}
             try:
-                # [v2.7.1] Mail: spawn 前系统标 working
+                # NOTE: _legacy_dispatch 仅在 router=None 时触发，当前配置不会进入。
+                # Mail 永远走 dispatch() 主路径（on_checks_passed 方案），不走此路径。
+                # 如果未来 legacy 路径被启用，需同步 on_checks_passed 逻辑。
                 is_mail_legacy = project_config.get("project_id") == "_mail" if project_config else False
                 if is_mail_legacy:
                     db_path_legacy = Path(project_config["db_path"]) if project_config and "db_path" in project_config else None