CAN-SPAM for Amazon Sellers: Marketing Email vs. Transactional Email Rules

If you email customers from your own brand list, the CAN-SPAM Act requires every marketing email to carry accurate header information, a subject line that matches the content, a clear statement that it is an ad, a valid physical postal address, and a working opt-out that you honor within 10 business days. Messages whose content is purely transactional or relationship (an order confirmation, a recall notice, a delivery of something already bought) are exempt from most of those rules, but they still may not contain false or misleading routing information.

This guide maps the federal CAN-SPAM rules onto the email an Amazon seller with a brand website or DTC store actually sends. It does not rule on any specific message; it gives you the FTC’s own tests to run against your templates. Sources are the FTC’s CAN-SPAM Act: A Compliance Guide for Business, the statute at 15 U.S.C. 7702 and 7704, and the FTC rule at 16 CFR Part 316 (all data checked 2026-10-10).

Does CAN-SPAM Apply to Your Email?

CAN-SPAM regulates “commercial electronic mail messages.” 15 U.S.C. 7702(2) defines one as any email “the primary purpose of which is the commercial advertisement or promotion of a commercial product or service (including content on an Internet website operated for a commercial purpose).”

Three points from the FTC guide catch small sellers off guard (FTC guide, August 2023 edition, data checked 2026-10-10):

• Volume does not matter. The guide says: “Despite its name, the CAN-SPAM Act doesn’t apply just to bulk email.” A single promotional email to one past customer is in scope.
• Business buyers are not exempt. “The law makes no exception for business-to-business email.” If you sell through Amazon Business and also email those buyers from your own list, the same rules apply.
• Consent does not switch the law off. CAN-SPAM is an opt-out law: the header, subject-line, postal-address, and opt-out rules apply to commercial email whether or not the recipient signed up. Prior “affirmative consent” removes only one requirement, the ad label (15 U.S.C. 7704(a)(5)(B)).

This guide covers email you send from lists built through your own channels, such as a DTC store or brand website. Messages sent inside Amazon’s Buyer-Seller Messaging are governed by Amazon’s own communication policies, which sit outside this article.

The CAN-SPAM Requirements at a Glance

The FTC guide lists eight main requirements for commercial email. The table pairs each with the statute section behind it (data checked 2026-10-10).

Two definitions sharpen the table. A “valid physical postal address” under 16 CFR 316.2(p) is your current street address, a Post Office box registered with USPS, or a private mailbox registered with a commercial mail receiving agency. And the subject-line rule in 7704(a)(2) turns on whether a subject heading “would be likely to mislead a recipient, acting reasonably under the circumstances, about a material fact regarding the contents or subject matter of the message.”

The ad label has no prescribed wording. The statute asks for “clear and conspicuous identification that the message is an advertisement or solicitation,” so the test is visibility, not a magic phrase.

Transactional vs. Marketing Email: The Five Categories

A “transactional or relationship message” is outside the definition of commercial email (15 U.S.C. 7702(2)(B)). The statute, at 7702(17)(A), limits it to email whose primary purpose is to:

1. Facilitate, complete, or confirm a commercial transaction the recipient has previously agreed to enter into with the sender.
2. Provide warranty information, product recall information, or safety or security information about a product or service the recipient used or purchased.
3. Notify the recipient of a change in terms or features, a change in standing or status, or give periodic account statements, for a subscription, membership, account, loan, or comparable ongoing relationship.
4. Provide information directly related to an employment relationship or benefit plan.
5. Deliver goods or services, including product updates or upgrades, that the recipient is entitled to under a transaction already agreed to.

The FTC guide adds a caution: “Keep in mind that the law views these categories narrowly.” It tells businesses not to assume that a message to a subscriber or member is transactional, and to ask whether a reasonable recipient would see the primary purpose as one of the five. Transactional messages are exempt from most of the Act, but under 7704(a)(1) they still may not carry materially false or misleading header information.

Here is how common seller emails line up against those categories. The right-hand column is the question to ask, not a verdict on your message.

Warranty emails matter for sellers who offer written warranties; our Magnuson-Moss warranty guide covers what the warranty itself must say.

Mixed Messages: The Primary Purpose Test

Most real seller email mixes content: an order confirmation with a “you might also like” row, or a care-tips newsletter with a coupon. The FTC guide says: “When an email contains both kinds of content, the primary purpose of the message is the deciding factor.” 16 CFR 316.3 spells out the test.

A message counts as commercial in any of these cases (316.3(a)):

• It “consists exclusively of the commercial advertisement or promotion of a commercial product or service.”
• It mixes ads with transactional or relationship content, and either a recipient reasonably reading the subject line would likely conclude it contains an ad, or the transactional content “does not appear, in whole or in substantial part, at the beginning of the body of the message.”
• It mixes ads with other non-transactional content (tips, stories, how-to), and either the subject line points to an ad, or a recipient reasonably reading the body would likely conclude the primary purpose is promotion.

For that last case, 316.3(a)(3)(ii) lists the factors: where promotional content sits (especially at the top), “the proportion of the message dedicated to such content,” and “how color, graphics, type size, and style are used to highlight commercial content.”

The transactional side is strict. Under 316.3(b), a message is transactional or relationship only if it “consists exclusively of transactional or relationship content.” A single coupon block can move a message out of that bucket, at which point the commercial tests above decide it.

One limit runs the other way. 15 U.S.C. 7702(2)(D) says a reference to a company or a link to its website “does not, by itself” make a message commercial if the contents or circumstances show a different primary purpose. Your logo and store link in a shipping notice do not turn it into an ad.

In practice, sellers who send both kinds of email keep two template families: transactional templates with the transaction at the top and no promotions, and marketing templates that carry every CAN-SPAM element by default.

Opt-Out Mechanics a Small Seller Has to Get Right

The opt-out rules are the part most often broken by tooling rather than intent. Each one below comes from the statute or the FTC rule (data checked 2026-10-10).

• It must keep working for 30 days. The return address or link must remain capable of receiving opt-out requests “for no less than 30 days after the transmission of the original message” (7704(a)(3)(A)(ii)). Deleting a campaign or shutting down a sending domain early can break this.
• 10 business days to stop. Once a request arrives, sending further commercial email within its scope more than 10 business days later is prohibited (7704(a)(4)(A)(i)). The clock also binds anyone sending on your behalf.
• No fees, no hoops. Under 16 CFR 316.5, you may not charge a fee, ask for “any information other than the recipient’s electronic mail address and opt-out preferences,” or require any step beyond “sending a reply electronic mail message or visiting a single Internet Web page.” A login wall or a multi-page survey before the unsubscribe fails this test.
• Menus are allowed. You can offer a list of email types to choose from, as long as it includes an option to stop all commercial email from you (7704(a)(3)(B)).
• No selling or sharing the address. After an opt-out, you may not sell, lease, exchange, or otherwise transfer the address, including on a mailing list, except for compliance purposes (7704(a)(4)(A)(iv)).

If you run several brands, decide up front whether an opt-out from one brand list stops all of them, and make the footer say so.

Who Is Responsible When an Agency or App Sends

The FTC guide is direct that hiring someone else does not move the obligation: “you can’t contract away your legal responsibility to comply with the law.” Both the company whose product is promoted and the company that actually sends the message may be held legally responsible, according to the guide.

That covers email service providers, agencies, and the apps sellers connect to their stores. If you are comparing tools in this space, our roundup of review request software describes what those products send; the compliance check for any email they send from your own list is the same table above. Review-related email also touches a separate FTC rule on review incentives, covered in our FTC Consumer Reviews Rule guide.

Penalties: What the Numbers Say

The FTC guide says: “Each separate email in violation of the CAN-SPAM Act is subject to penalties of up to $53,088” (data checked 2026-10-10). The amount is per email, so a single noncompliant template sent to a list multiplies quickly.

That figure is the 2025 inflation-adjusted level. In a Federal Register notice published September 15, 2026 (document 2026-18853), the FTC said its “civil penalty amounts will remain unchanged during 2026” and that it “will continue to apply the 2025 civil penalty levels.” The FTC guide itself notes it is edited to reflect inflation-adjusted penalty maximums, so check the current figure before you quote it.

The FTC guide also lists criminal penalties, including imprisonment, for aggravated practices such as “harvesting email addresses or generating them through a dictionary attack.”

Checklist Before a Marketing Email Goes Out

Run each template against this list (sources as cited above, data checked 2026-10-10):

1. The From name and address identify your business, and the sending domain is one you control.
2. The subject line describes what is actually in the email.
3. The email says it is an advertisement, visibly, unless every recipient gave prior affirmative consent.
4. The footer shows a street address, USPS-registered P.O. box, or registered private mailbox.
5. The unsubscribe link needs nothing beyond the email address and preferences, and lands on a single page.
6. The unsubscribe link works for at least 30 days after the send.
7. Opt-outs reach every list and every sending tool within 10 business days.
8. Opted-out addresses are never exported to a partner, agency list, or co-marketing swap.
9. Templates labeled “transactional” contain only transactional content, with the transaction at the top.
10. Contracts with your email provider or agency name who maintains the suppression list.

If you use email to drive traffic back to your Amazon listings, Amazon Attribution tags those links; the tags do not change any of the rules above.

Frequently Asked Questions

Does CAN-SPAM require opt-in consent before I email customers?

No. The FTC guide notes that you “don’t need to get members’ consent to send them marketing emails”; the header, subject-line, address, and opt-out rules apply either way. Affirmative consent, as defined in 15 U.S.C. 7702(1), only removes the ad-identification requirement under 7704(a)(5)(B).

Is a post-purchase follow-up email transactional?

It depends on content. If it only confirms the order, delivers what was bought, or gives warranty, recall, or safety information, it can fit the categories in 7702(17). Once it promotes other products or offers, 16 CFR 316.3 decides whether its primary purpose is commercial, based on the subject line and what sits at the top of the body.

Can I use a P.O. box as my postal address?

Yes, if the Post Office box is accurately registered with the United States Postal Service. 16 CFR 316.2(p) also accepts your current street address or a private mailbox accurately registered with a commercial mail receiving agency.

Bottom Line

CAN-SPAM does not stop an Amazon seller from emailing its own customers. It sets the format: an honest header and subject line, an ad label, a postal address, and an opt-out that works for 30 days and takes effect within 10 business days. Keep transactional templates purely transactional, build marketing templates that meet every requirement in the table above by default, and remember the obligation stays with you when a vendor hits send. For the wider picture of regulatory checks on your account, see our guide to Amazon Manage Your Compliance.