3.3.5.19 Receiving Acknowledgments in a MessageCount Field

A relay server MUST process an acknowledgment in a MessageCount field as specified in section 3.1.5.19.

Additionally, when an acknowledgment is received for messages sent on an outbound fanout session, the MessageProcessingState for the corresponding FanoutAddressingList entries MUST be set ‘complete’. Completion notifications MUST be generated as specified in section 3.1.4.7.