The law increases the penalty to 20 years' imprisonment for any act deemed to undermine the authority of Castro's government. How the law is applied remains to be seen, but so far there haven't been any cases involving email. None that have been publicized, at any rate. Some Cuban students have their own email accounts, although this is limited mostly to graduate students. They are free to contact graduate students in other countries, as long as it's to exchange ideas about things like pulsars in the constellation Aquila, or mitochondrial activity in infants.
Faculty members are also new to email.
Literature professor Guillermo Rodrigues Rivera was in the middle of planning a trip to Italy using email, a much more efficient method than he's endured in the past. It's very new. Cuba has always been open to the world. We are an island in the Gulf of Mexico between the two Americas. Cuba made its wealth by its position.