Redelivered is set by a receiving QAManager when it detects that a message being received was received before.
For example, an application receives a message using a QAManager opened with AcknowledgementMode.EXPLICIT_ACKNOWLEDGEMENT,
and shuts down without acknowledging the message. When the application starts again and receives the same message the Redelivered
header will be true.
For more information about getting and setting message headers and properties, see QAnywhere messages.