The CAN-SPAM (Controlling the Assault of Non-Solicited Pornography and Marketing) Act, sets requirements for any e-mail that advertises or promotes a commercial product or service, including Web site content. Here are four key requirements for commercial e-mails:
(1) Accurate header information. Your e-mail's “To” and “From” fields, as well as the originating domain name and e-mail address, must be accurate and identify the person who initiated the e-mail.
(2) No deceptive subject lines. The subject line cant mislead the recipient about the content or subject matter of the message. Your message must contain clear notice that the content is an advertisement or solicitation and that the recipient can opt-out of receiving more commercial e-mail from you.
(3) Easy opt-out method. You must provide a return e-mail address or another Internet-based response mechanism that allows recipients to ask you not to send future e-mail messages. When you receive an opt-out request, the law gives you 10 business days to stop sending e-mail to the requester’s e-mail address.
(4) A valid physical mailing address.
