Secondly, the RMD doesn't have to acknowledge the messages it has received.

其次，RMD并非必须对它已接收到的全部消息作出确认。

youdao

Note that the acknowledgement isn't just for one message, it acknowledges all the messages successfully received by the RMD.

注意，这种确认并不是与消息一一对应的，而是代表对所有由RMD成功接收的消息的确认。

youdao

The RMD delivers these messages to the server application, maintaining any guarantees that it offers, such as exactly-once and in-order.

RMD将这些消息转送给服务端应用，并提供唯一性、有序性等基本保障。

youdao

One reason people are probably confused is because last year Congress issued an RMD holiday.

FORBES: Take Money Out Of Your IRA In 2010, Or Else

The law imposes a 50% excise tax on any RMD a taxpayer fails to take.

FORBES: Magazine Article

They got to take advantage of the RMD holiday, so there was no April 1 deadline in 2010.

FORBES: April 1 Deadline Looms For IRA Holders