Not an outright scam, they are just fishing for new customers by spamming people. I got those email as well and so did plenty of other people i know. They are hoping that by sending these type of emails they might scare a few website owners into registering useless ccTld versions of their domain name with them. Don't worry, no need buy each and every cctld version of your name especially if you hold the trademark and don't inend to do business in those countries.