When the employer blocks an electronic communication, it tells the worker as soon as practicable (a stopped delivery notice). No notice is needed where the employer believes the communication is a commercial electronic message under the Spam Act 2003, might interfere with or damage the employer's computers, networks, programs or data, or might reasonably be seen as threatening, harassing or offensive, or where software designed to stop those types did so; nor, for a communication sent by a worker, where the employer did not and could not reasonably know the sender's identity or that a worker sent it.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.