The CAN-SPAM Act of 2003 (Controlling the Assault of Non-Solicited Pornography and Marketing Act) is a federal law that establishes requirements for those who send commercial email. It spells out penalties for spammers and companies whose products are advertised in spam if they violate the law, and gives consumers the right to ask emailers to stop spamming them. Among other measures, the law:
Bans false or misleading header information.
Your email's "From," "To," and routing information – including the originating domain name and email address – must be accurate and identify the person who initiated the email.
Prohibits deceptive subject lines.
The subject line cannot mislead the recipient about the contents or subject matter of the message.
Requires that your email give recipients an opt-out method.
You must provide a return email address or another Internet-based response mechanism that allows a recipient to ask you not to send future email messages to that email address, and you must honor the requests. Any opt-out mechanism you offer must be able to process opt-out requests for at least 30 days after you send your commercial email.
It requires that commercial email be identified as an advertisement and include the sender's valid physical postal address.
Your message must contain clear and conspicuous notice that the message is an advertisement or solicitation and that the recipient can opt out of receiving more commercial email from you. It also must include your valid physical postal address.