diff --git a/notifications.py b/notifications.py
index bd3e9e7..b0380ac 100644
--- a/notifications.py
+++ b/notifications.py
@@ -98,9 +98,9 @@ async def check_and_notify_threshold(agent_name: str):
     if recent:
         return
 
-    # Get admin user emails
+    # Get admin user emails (exclude placeholder accounts with no real domain)
     admin_cursor = users_collection.find(
-        {"is_admin": True, "is_active": True},
+        {"is_admin": True, "is_active": True, "email": {"$not": {"$regex": r"@agenthub\.com$"}}},
         {"email": 1},
     )
     admin_emails = [doc["email"] async for doc in admin_cursor]
@@ -264,9 +264,9 @@ async def send_weekly_agent_digest():
             except Exception:
                 agent["created_by_email"] = created_by
 
-    # Get admin emails
+    # Get admin emails (exclude placeholder accounts with no real domain)
     admin_cursor = users_collection.find(
-        {"is_admin": True, "is_active": True},
+        {"is_admin": True, "is_active": True, "email": {"$not": {"$regex": r"@agenthub\.com$"}}},
         {"email": 1},
     )
     admin_emails = [doc["email"] async for doc in admin_cursor]