diff --git a/server/brief-outbox.mjs b/server/brief-outbox.mjs
index 9243410..b0bec69 100644
--- a/server/brief-outbox.mjs
+++ b/server/brief-outbox.mjs
@@ -40,7 +40,9 @@ export function createBriefOutbox(directory) {
   }
   return {
     prepare(week,email,messages) {
-      const id=hash(JSON.stringify([week,email])),manifest=JSON.stringify(messages);
+      const manifest=JSON.stringify(messages);
+      parseManifest(manifest);
+      const id=hash(JSON.stringify([week,email]));
       return transaction(db=>{
         const row=db.prepare('SELECT manifest FROM brief_batches WHERE id=?').get(id);
         if(row) {