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GlossaryUpdated

What is the CAN-SPAM Act?

The CAN-SPAM Act is a United States law that sets rules for commercial email. It requires accurate header information, a non-deceptive subject line, a clear opt-out mechanism, prompt honouring of opt-outs and a valid physical postal address. It applies to commercial messages, not to every transactional message.

Key facts

  • The CAN-SPAM Act requires commercial email to include a functioning opt-out mechanism and a valid physical postal address. Source
  • The Act prohibits deceptive subject headings and false or misleading header information. Source
  • The FTC's CAN-SPAM rule at 16 CFR Part 316 sets related requirements for commercial email. Source

What the CAN-SPAM Act is

This definition is part of the Mailprompt glossary. The CAN-SPAM Act is a United States federal law that regulates commercial email. It is not a general anti-spam law that bans unsolicited mail; it sets rules that a commercial sender has to follow.

The law is enforced by the Federal Trade Commission and other agencies. The statute and the FTC's rule are the authoritative sources. A glossary entry can explain the shape of the requirements, but it cannot replace legal advice for a specific campaign.

The core requirements

The Act asks for accurate header information. The From, Reply-To and routing information should identify the sender rather than hide behind a misleading domain. A subject line should not mislead the recipient about the contents of the message.

A commercial message needs a functioning opt-out mechanism. The recipient should be able to ask not to receive future commercial mail, and the sender should honour that request promptly. The message also needs a valid physical postal address for the sender.

Those requirements are why a marketing email has a footer with an unsubscribe link and a postal address. The footer is not decoration; it is part of the legal baseline.

Commercial and transactional messages

The Act distinguishes commercial messages from transactional or relationship messages. A receipt, a shipping confirmation or an account security notice is usually transactional. A promotion, a newsletter or a cart reminder is usually commercial.

The distinction is about the primary purpose of the message, not the label in the platform. A promotional offer inserted into a receipt can change the analysis. A sender who relabels a promotion as transactional to avoid the opt-out requirement is taking a legal risk.

Transactional messages still have their own accuracy and header expectations. The absence of a marketing opt-out is not a licence to mislead.

Opt-out mechanics

An opt-out has to be clear and easy to use. A link that requires a login, a form that asks for unrelated information or a process that takes weeks is not a good-faith mechanism. The recipient should be able to stop commercial mail without jumping through hoops.

The sender should honour the request within the time the law allows and should keep the suppression record. Sending another campaign to a person who opted out is a visible violation and a deliverability problem.

A one-click unsubscribe is also a requirement in the bulk-sender guidelines of major mailbox providers. The legal baseline and the provider rules overlap, but they are not identical. Build for the stricter of the two.

How this fits Mailprompt

Mailprompt's approval gate is a place to check the footer, the postal address and the opt-out link before a marketing send. The send gate checks suppression and consent before the message leaves the account.

Neither control is a legal guarantee. The sender remains responsible for the content and the list. The product can make the requirements easier to meet; it cannot make a non-compliant campaign compliant.

  • List hygiene covers the suppression and consent records behind the opt-out.
  • Deliverability is the outcome that compliance supports.
  • Email flow is where automated messages need the same footer.

Frequently asked questions

Does CAN-SPAM apply to transactional email?

The Act distinguishes commercial messages from transactional or relationship messages. A confirmation, receipt or account notice may fall outside the commercial category, but the distinction depends on the content and the context. Do not relabel a promotion as transactional to avoid the rules; the label is not a defence if the message is really marketing.

What must a commercial email include?

Accurate header information, a subject line that does not mislead, a clear and functioning way to opt out, a valid physical postal address and a message that honours the opt-out promptly. The exact legal wording is in the statute and the FTC rule; this glossary entry is a summary, not legal advice.

What happens if a sender violates the Act?

The Act provides for civil enforcement, and the FTC and other agencies can bring actions. The details and the available remedies are set by the statute and the courts. A sender with a compliance question should consult a lawyer rather than rely on a glossary entry or a vendor blog post.

Sources