I was not precise when I said notifications. I already set it to "only mentions". My problem was that each channel will "light-up" when anyone is commenting in

I was not precise when I said notifications. I already set it to "only mentions". My problem was that each channel will "light-up" when anyone is commenting in them. I have to mute each channel or mark all as read for the whole server to avoid this. On IRC you opt in to channels.