When ON, every outgoing email (PO dispatch, GRN reminders, discrepancy notices, alerts) is redirected to the test address below — vendors, warehouses, and everyone else receive nothing. The real recipients are shown in the email body so you can verify routing. Turn OFF to resume normal delivery.

Every allocation email subject is {prefix}{number}. The number increments atomically per email, so two people allocating at once never get the same reference.