How do I block all external contacts in iMessages

Hello,
So I am an IT guy at a school,  We are using iPads to assist our students with communication difficulties.  I would like to make it so that they can only message the approved email addresses.  Essentially, I am trying to create a whitelist, and also make it so that the students cannot add contacts to the "whitelist"  is there a way that I can do this?

Additionally, I forgot to mention that I want to block externals from contacting iPad, as well as, block iPad from messaging outside of whitelist.

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