I've been getting hundreds of emails from a guy named Viktor Tyurin who lives in Magnitogorsk in Russia. He's trying to get the staff to click on a malicious google docs link in order to install malware. It would be very nice to be able to block emails from IP addresses in Russia, China and Ukraine for example, the same way I can block country IPs in my Sophos firewall. 99% of my email attacks come from 8 or 10 different countries that have no business sending me unsolicited emails.