Under normal conditions PMDF accepts, processes, and promptly delivers messages. If a message can not be delivered immediately, PMDF will periodically retry the delivery. Intervention by a system or network manager is generally not required, as PMDF is designed to perform its functions unattended as much as possible. It is a good idea, however, to periodically inspect the PMDF queue directories. System or network problems over which PMDF has no control can adversely affect normal operation. In addition, unusual behavior from PMDF can often point out network problems which can otherwise go unnoticed.
See also Chapter 33, which discusses monitoring PMDF activity. A baseline for what normal PMDF activity looks like at your site can be helpful when questions arise.