Merge pull request #3526 from nextcloud/fix/missing-account-mailbox-ids-message

Fix missing but expected accountId and mailboxId on message JSON

lib/Controller/MessagesController.php

@@ -233,6 +233,8 @@ class MessagesController extends Controller {
 				$a
 			);
 		}, $json['attachments']);
+		$json['accountId'] = $account->getId();
+		$json['mailboxId'] = $mailbox->getId();
 		$json['databaseId'] = $message->getId();
 
 		return new JSONResponse($json);