CAN-SPAM

It's a U.S. law passed in 2003 that establishes the rules for commercial email and commercial messages. It gives recipients the right to have a business stop emailing them and outlines the penalties incurred for those who violate the law. For example, CAN-SPAM is the reason businesses are required to have an "unsubscribe" option at the bottom of every email.

CAN-SPAM doesn’t just apply to bulk email; it applies to all commercial messages. According to the FTC website, here are the main requirements:

1. Don’t use false or misleading header information
2. Don’t use deceptive subject lines
3. Identify the message as an ad
4. Tell recipients where you’re located
5. Tell recipients how to opt-out of future email messages
6. Honor opt-out requests promptly
7. Monitor what others are doing on your behalf

Each separate email in violation is subject to penalties of up to $43,792.