[Alneyan]

Hmm, any medium of communication where you cannot see/touch/smell/hear the envoy ought to work well enough.

However, I would like to make an addendum on this, as it should be more along these lines:
57': Besides, the said communications will be based on SEIV diplomatical system, where you can choose between various actions and select your tone. I will not give the envoy the leisure to write their own Messages however, lest they should manage to bewitch me through the clever use of words.