Enables the handler to signal to the Apps framework whether this handler should actually be executed for the message about to be sent.
The message which is being sent
An accessor to the environment
An accessor to the outside world
whether to run the execute or not
Method which is to be used to destructively modify the message.
The message about to be sent
The builder for modifying the message via methods
An accessor to the environment
An accessor to the outside world
An accessor to the App's persistence
the resulting message
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Handler called when an App wants to modify a message in a destructive way.