ts should assume that
 message retention policies are set administratively. Message retention policy governs the reliability of message
 delivery from destination to message consumer. For example, if a client's message storage space is exhausted, some
 messages may be dropped in accordance with a site-specific message retention policy.

 <p>
 A message is guaranteed to be delivered once and only once by a Jakarta Messaging provider if the delivery mode of the message is
 <code>PERSISTENT</code> and if the d