Your MediatR Command Just Lost an Email. Here's Why.

You ship a CheckoutCommand . It writes an Order , charges the card, then calls _mediator.Publish(new OrderPlaced(...)) which fires off SendConfirmationEmailHandler and NotifyWarehouseHandler . A week later, support pings you: a customer was charged, sees the order in their history, but never got a confirmation email. The warehouse has no record either. You dig into the logs. [18:42:13] INF Order 4f2a... created [18:42:14] INF Payment captured [18:42:15] ERR SMTP timeout (System.Net.Sockets.Socke