How do I prevent people from unsubscribing from my emails?

If you don't want to break the law, you should never prevent someone from unsubscribing from your emails. CAN-SPAM, one of the most important laws you need to follow as a marketer, says that email marketers should always make it easy for people to unsubscribe from their emails by providing a clearly visible link in every email message and honoring those unsubscribes in a timely manner.