Indicates the return value of a message-handling method should be sent as a
to the specified destination(s)
further prepended with
where the user name
is extracted from the headers of the input message being handled.
@SendToUser may be used on the same method
in which case a message is sent to the destinations of both annotations.
This annotation may be placed class-level in which case it is inherited
by methods of the class. At the same time, method-level
@SendToUser annotations override any such at the class level.