Having said that, it is possible that you're subscribed twice, in slightly different names but which point to the same mailstop. This can be better than unsubscribing and subsequently resubscribing, as any options you may have set will be preserved. Another case of strange listserver behaviour. It's a bug. There are some acronyms and symbols used I don't understand.
Email has quite a few acronyms and symbols used that are unique to the medium.
My mail from the list has stopped. The listserver is not the most reliable computer system in the world, and it may be down. If so, obviously it can't send out mail. This will result in a list of subscribers being sent back to you. The list occaisionally drops people for no obvious reasons, so if you're not on the list at all, just resubscribe.