Spam e-mails (more commonly called "spam") are unsolicited commercial emails. Spam was entirely regulated at the state level until CAN-SPAM was enacted in 2003. Yet, with CAN-SPAM, this is now an issue primarily governed by federal law. CAN-SPAM Act sets basic rules for commercial e-mail, and establishes requirements for messages and penalties for violations.
In general, CAN-SPAM (under 15 U.S.C. § 7704) requires business entities to do the following:
To determine whether an e-mail is subject to CAN-SPAM, it depends on whether the message's primary purpose is "commercial" or "transactional/relationship" as both are defined in 15 U.S.C. § 7702. Commercial purposes include promoting commercial websites and online businesses, or some business-to-business communications. An example would be a message informing a customer of a new product or service that is available on a business's website. Commercial messages are anything that have the primary purpose of advertising a product or service like an advertisement or promotion. Those types of content are subject to the requirements of CAN-SPAM.
Transactional and relationship purposes are treated more leniently. Transactional and relationship purposes cover what wouldn't be considered a commercial purpose. This includes messages primarily meant to facilitate, complete, or confirm a transaction that was agreed upon like a receipt. This type of content is mostly exempt from CAN-SPAM, although, it cannot include false or misleading header information in the electronic message (e.g., Amazon order update coming from a non-Amazon address).
However, there are many circumstances where the two types of purposes can be blurred or difficult to discern. So, a better determination would be needed to evaluate which aspects of CAN-SPAM would apply to the message.
Any violation of CAN-SPAM is subject to penalties of that can be capped between one and two million dollars, if the enforcement action is brought by the Internet Service Provider or the state government, respectively. There are other ways to violate CAN-SPAM as well, such as "aggravated violations." This includes any knowing violation of CAN-SPAM, or actions like address harvesting or dictionary attacks. These would result in potentially trebled damages.
The international community has joined in on regulating spam by enacting similar measures. These include Canada, United Kingdom, Australia, Japan, China, Germany, and European Union. In general, when it comes to the differences between the foreign policies and the American counterpart, it has to do with the recipient's consent, such as the European Union Directive On Privacy requiring "prior explicit consent" before messages are sent. For example, this task may be accomplished by providing a button that says: "Click here to be notified of our upcoming products." Other pitfalls that can lead to violations in these jurisdictions are a failure to prove consent before sending the spam (e.g., purchasing an email list for advertising purposes).