diff --git a/server/brief-outbox.mjs b/server/brief-outbox.mjs
index d9a4369..9243410 100644
--- a/server/brief-outbox.mjs
+++ b/server/brief-outbox.mjs
@@ -7,7 +7,7 @@ const hash = value => createHash('sha256').update(value).digest('hex');
 function parseManifest(raw) {
   try {
     const messages = JSON.parse(raw);
-    if (!Array.isArray(messages) || messages.some(message => !message || typeof message !== 'object' || Array.isArray(message))) throw new Error('manifest biçimi');
+    if (!Array.isArray(messages) || messages.some(message => !message || typeof message !== 'object' || Array.isArray(message) || (message.to != null && !['string','number'].includes(typeof message.to)) || (message.channel != null && typeof message.channel !== 'string'))) throw new Error('manifest biçimi');
     return messages;
   } catch {
     throw new Error('Haftalık özet manifesti bozuk; gönderim işlemi durduruldu.');