The CAN-SPAM Act explains the rules for email marketers, whether they are good or bad. If you are sending an email for commercial use, you will need to do the following: 1. Include an unsubscribe method. 2. Actually unsubscribe someone when they request it, and do it on time. 3. If sending for commercial use, you must include a physical address. 4. While not explicitly prohibited, sending people who have not been discouraged.