Yet, the message contents may be time-sensitive, so if the message isn’t received by a certain deadline, it should be ignored and discarded. In this situation, the sender can use Message Expiration (176) to specify an expiration date. If the messaging system cannot deliver a message by its expiration, it should discard the message or move it to a Dead Letter Channel (119). Likewise, if a receiver gets a message after its expiration, it should discard the message.
