In the case of delivery failure for transactional messages, the message is sent to the transactional dead-letter queue on the source computer in all negative and in-doubt cases.

一旦事务性消息传递失败，则在所有否定的和不确定的情况下，消息将被发送到源计算机上的事务性死信队列。

youdao

However, you can request that an acknowledgment message be sent if a delivery failure prevents a message from arriving in the queue.

不过，您可以请求在传递失败妨碍了消息到达队列时发送一条确认消息。

youdao

And in an industry which is about 40yrs old and relatively immature on a program which runs out over 10yrs, I would expect that there will be supplier failure and delivery failure in parts and it is my responsibility to plan for that.

BBC

Additionally, injured parties are beginning to commence lawsuits against greenwashers when there is a failure of delivery.

FORBES: "Greenwashing": Deceptive Business Claims of "Eco-Friendliness"

The delivery service, part of the Royal Mail Group, apologised for the failure in the system which allowed people using the mail tracing service access to the name, postcode and signature at various addresses.

BBC: Royal Mail's Price Finder website hits glitch