Brazil

From the moment I started using Zoho Mail a little over two years ago, I have been getting a minimum of 50 spam emails a day from Brazil, offering me flights from Sao Paolo to Rio, cars, internet, perfume etc all priced in Brazilian Reals. As I live and work in London, England and have absolutely no connection to Brazil (I've never even been to Latin America) how has this happened? I never had any emails from Brazil before moving to Zoho. Is there a way to exclude ALL emails emanating from Brazil? I'm prepared to live with the loss.