diff --git a/config/packages/messenger.yaml b/config/packages/messenger.yaml
index 693fd402..65b0eace 100644
--- a/config/packages/messenger.yaml
+++ b/config/packages/messenger.yaml
@@ -13,6 +13,11 @@ framework:
             sync: 'sync://'
             scheduler_default:
                 dsn: 'schedule://default'
+                # SchedulerTransport cannot send(); any retry re-send crashes the
+                # worker with "cannot send messages". Disable retry — a transient
+                # handler failure (e.g. DB blip) is simply retried on the next tick.
+                retry_strategy:
+                    max_retries: 0
 
         routing:
             'App\Shared\Message\SendSmsMessage': async