Again, magic that touches upon mental influence of any sort is the strictest taboo. The people have a long history of dealing with fae as one of the many hazards in their lives. Though perhaps the public doesn’t need to know about the going ons of dark, secluded dungeons.
Again with fae the local creatures are potentially suspect so we turn to the likes of Sending. There’s a caveat of range in play here that mainly limits it to shorter range messages, but a few simple relay posts trivialize this.
And now to dwell on a folktale where a fae replaced a messenger bird to disastrous results.