The inclusion of a reference to a commercial entity or a link to the website of a commercial entity in an electronic mail message does not, by itself, cause such message to be treated as a commercial electronic mail message for purposes of this chapter if the contents or circumstances of the message indicate a primary purpose other than commercial advertisement or promotion of a commercial product or service.
The term “electronic mail address” means a destination, commonly expressed as a string of characters, consisting of a unique user name or mailbox (commonly referred to as the “local part”) and a reference to an Internet domain (commonly referred to as the “domain part”), whether or not displayed, to which an electronic mail message can be sent or delivered.
The term “electronic mail message” means a message sent to a unique electronic mail address.
The term “header information” means the source, destination, and routing information attached to an electronic mail message, including the originating domain name and originating electronic mail address, and any other information that appears in the line identifying, or purporting to identify, a person initiating the message.
The term “initiate”, when used with respect to a commercial electronic mail message, means to originate or transmit such message or to procure the origination or transmission of such message, but shall not include actions that constitute routine conveyance of such message. For purposes of this paragraph, more than one person may be considered to have initiated a message.
The term “recipient”, when used with respect to a commercial electronic mail message, means an authorized user of the electronic mail address to which the message was sent or delivered. If a recipient of a commercial electronic mail message has one or more electronic mail addresses in addition to the address to which the message was sent or delivered, the recipient shall be treated as a separate recipient with respect to each such address. If an electronic mail address is reassigned to a new user, the new user shall not be treated as a recipient of any commercial electronic mail message sent or delivered to that address before it was reassigned.
If an entity operates through separate lines of business or divisions and holds itself out to the recipient throughout the message as that particular line of business or division rather than as the entity of which such line of business or division is a part, then the line of business or the division shall be treated as the sender of such message for purposes of this chapter.
The Commission by regulation pursuant to section 7711 of this title may modify the definition in subparagraph (A) to expand or contract the categories of messages that are treated as transactional or relationship messages for purposes of this chapter to the extent that such modification is necessary to accommodate changes in electronic mail technology or practices and accomplish the purposes of this chapter.