diff --git a/src/daemon/ticker.py b/src/daemon/ticker.py
index 34fce13..84f3a0f 100644
--- a/src/daemon/ticker.py
+++ b/src/daemon/ticker.py
@@ -409,11 +409,18 @@ class Ticker:
 
         now = datetime.utcnow().isoformat()
         # 重置到 pending 时清空 assignee（避免残留导致重复路由到同一 Agent）
+        # 但 Mail 的 assignee 是收件人，永不清空
         if new_status == "pending":
-            conn.execute(
-                "UPDATE tasks SET status=?, assignee=NULL, resumed_from=NULL, updated_at=? WHERE id=?",
-                (new_status, now, task_id),
-            )
+            if self._current_project_id == "_mail":
+                conn.execute(
+                    "UPDATE tasks SET status=?, updated_at=? WHERE id=?",
+                    (new_status, now, task_id),
+                )
+            else:
+                conn.execute(
+                    "UPDATE tasks SET status=?, assignee=NULL, resumed_from=NULL, updated_at=? WHERE id=?",
+                    (new_status, now, task_id),
+                )
         elif new_status == "paused":
             # 记录暂停前状态，恢复时回到原状态
             conn.execute(