Controlling the Assault of Non-Solicited Pornography and Marketing Act (CAN-SPAM) prohibits deceptive emails. It establishes requirements for commercial messages, gives recipients the right to have you stop emailing them, and spells out tough penalties for violations.
Each separate email in violation of the CAN-SPAM Act is subject to penalties of up to $46,517. CAN-SPAM applies to all emails, even business-to-business.
Here are some pointers for being compliant:
Don’t use false or misleading header information
Don’t use deceptive subject lines
Identify the message as an ad
Tell recipients where you’re located (valid physical postal address)
Tell recipients how to opt out of receiving future emails from you. Make sure your spam filter doesn’t block these opt-out requests
Honor opt-out requests promptly (within 30 days)
Monitor what others are doing on your behalf
For more information, check out the resources at the Federal Trade Commission.