CAN-SPAM Act of 2003
Controlling the Assault of Non-Solicited Pornography And Marketing Act

- establishes legal requirements for commercial e-mailers

If you're an email marketer, you're sending spam if:
- the message header doesn't have a truthful subject line
- you don't provide a valid return address
- your message doesn't clearly state that it's an ad
- your message doesn't have a simple way to opt out
- you keep sending ads 10 days after the person has opted out

How to Limit Spam (