nd increase a message's size, some Jakarta Messaging providers may be able to optimise
 message overhead if they are given a hint that the timestamp is not used by an application. By calling this method, a
 Jakarta Messaging application enables this potential optimisation for all messages sent using this <code>MessageProducer</code>. If the
 Jakarta Messaging provider accepts this hint, these messages must have the timestamp set to zero; if the provider ignores the hint,
 the timestamp must be set to its no