internet - Does banning Chinese spammers help?

Last week I got an email from Holland complaining that my email addresses bounched. There are large problems concerning email, including spam, viruses and a general overload of information, but I had no clue why this one person in Holland could not get through to me.
Today I discovered that my provider at Shanghai Telecom is blacklisted. That also was not such a shocking announcement, since much of the spam seems to originate from China. Wat surprised me was that banning my provider had so little effect. What sense does a blacklist have, when only one in a million emails is actually stopped?