[GATEWAY] 19:15:10 trace=bb88 → POST /api/notify  
[QUEUE]   19:15:10 trace=bb88 → Enqueued notify_user  
[WORKER]  19:15:11 trace=bb88 → ERROR: SMTP 421 temp fail  
[WORKER]  19:15:41 trace=bb88 → Retry 1  
[WORKER]  19:16:11 trace=bb88 → Retry 2  
[WORKER]  19:16:41 trace=bb88 → Dropped after 2 retries  
Жалобы: письмо иногда не приходит.