The second crowd who can't seem to understand unsubscription requests is Sahara Computers. As in my previous incident with TurboCASH, I was receiving four copies of all their sales news. This is usually about ten emails a week, on average, including a price list exceeding 500KB. So, when the price list is sent out, I get over 1.5MB of spam.
I say spam, because I've asked them on at least two occasions to remove the domain and so far, nothing.