diff --git a/packages/twenty-server/src/workspace/messaging/services/fetch-messages-by-batches.service.ts b/packages/twenty-server/src/workspace/messaging/services/fetch-messages-by-batches.service.ts
index a9a60b063..21872a679 100644
--- a/packages/twenty-server/src/workspace/messaging/services/fetch-messages-by-batches.service.ts
+++ b/packages/twenty-server/src/workspace/messaging/services/fetch-messages-by-batches.service.ts
@@ -268,7 +268,7 @@ export class FetchMessagesByBatchesService {
 
         return {
           role,
-          handle: address || '',
+          handle: address?.toLowerCase() || '',
           displayName: name || '',
         };
       });