In a real business world, knowing how to send emails is very important. If you have to file a finance report from your business trip and you finish it at home after work  and it was due that day, you should be able to send it through email so you don't have to turn it in late tomorrow. That is important. Blank carbon copies are important as well. You don't want to send any spam you've picked up from the Internet to your boss.That would be disastrous.