diff --git a/src/api/mail_routes.py b/src/api/mail_routes.py
index 34d67f3..dddc62b 100644
--- a/src/api/mail_routes.py
+++ b/src/api/mail_routes.py
@@ -214,7 +214,7 @@ async def mail_summary():
         meta = _mail_meta(t)
         if not meta.get("is_read", False):
             unread += 1
-        t = meta.get("type", "inform")
-        by_type[t] = by_type.get(t, 0) + 1
+        mtype = meta.get("type", "inform")
+        by_type[mtype] = by_type.get(mtype, 0) + 1
 
     return {"total": total, "unread": unread, "by_type": by_type}