3.1.5.19 Receiving Acknowledgments in a MessageCount Field

Upon receipt of a Noop command (as specified in section 3.1.5.13), Message command (as specified in section 3.1.5.10), or ConnectClose command (as specified in section 3.1.5.4) containing a nonzero MessageCount field, the indicated number of oldest entries in the OutboundMessageList table for the underlying connection (2) MUST be removed. The higher-layer application can discard any associated data.

Additional server-specific processing of acknowledgments received by a relay server on a fanout session MUST be performed as specified in section 3.3.5.19.