Since e-mail slave can govern post-hypnotic suggestion, it should also be able to make some hallucinate, right? For example, could you create effects similar to files like CursedPlugs by mere suggestions using e-mail slave?
And if so, the bigger question is how? Should the subject simply listen to the e-mail slave file more often so the suggestions in the e-mails get stronger? Or perhaps a technique consisting of daily visualization with the suggestion that it will become more real with every time?