Alain, I don't believe he's receiving messages like he's supposed to. I'd asked him for clarification and it sounds like he thinks he's being blocked. He says he's not getting anything at all through lists.phcomp.co.uk, only through other places. I wasn't given a lot of detail, just a very emphatic, please make it stop because something's wrong.
The better part of me wants to think this is a simple config accident, something got misclicked, but... it doesn't look good. I'm concerned about the effect this is having on his mental heath -- I don't know enough about medicine to evaluate his symptoms one way or another, far from it, but I know what someone sounds like when their mind is in enough pain to affect normal thought processes, and Luke sounds EXTREMELY unhealthy to me.
I'm unusually sensitive to it, especially for someone with autism... having a mother who suddenly falls ill and becomes a perpetrator of nonphysical domestic violence against you for over a decade will do that to a person. Sadly.