Thank you for writing to Boys Town with your concerns about your friend. You show such dedication to this friend who is in need of help due to drinking. It is difficult to say what type of help your friend needs. Some of his friends seem to think that he is in trouble; others seem to think that he is "fine". One major concern of course, is that his drinking is against the law. If caught, he could be ticketed and receive consequences that effect him for years to come. His drinking could also result in making bad decisions, getting poor grades, loss of friends, and physical harm to self, etc.
If you are interested in helping him, you might consider writing a letter to share your concerns. While he might be able to block your computer communications, a physical letter in hand would be more difficult for him to ignore. You can help him by offering your encouragement that he stop before serious consequences occur. Please feel free to include some information about the Boys Town National Hotline. We would be happy to talk with your friend about his drinking. Perhaps he would be willing to talk with someone at a Hotline. Counselors are available around the clock to talk.
You are a good friend. Even if your friend does not respond back to you, you know that you have done your part to express your concern.