An AI assistant asked to “write a marketing email” will produce persuasive copy, but it won’t add a physical postal address, a working unsubscribe link, or a truthful subject line unless you specifically ask for them — and under the CAN-SPAM Act, those aren’t optional extras, they’re legal requirements for any commercial email sent to US recipients. This isn’t legal advice; it’s a plain-English rundown of what the FTC’s own compliance guide requires, so you know what to check before a draft goes out.
What CAN-SPAM actually requires
Per the FTC’s CAN-SPAM Act Compliance Guide for Business, these are the core requirements for a commercial email:
| Requirement | What the FTC guide says | What an unprompted AI draft usually skips |
|---|---|---|
| Accurate header information | “From,” “To,” and routing information must accurately identify who sent the message | Not usually an issue — this lives in your sending platform, not the draft |
| Truthful subject line | The subject line must accurately reflect the message content | A drafted subject optimized purely for open rate, with no check against the body |
| Clear ad disclosure | Must clearly and conspicuously disclose the message is an advertisement | Almost always missing — nothing prompts an assistant to add this on its own |
| Valid physical postal address | A street address, registered PO box, or registered private mailbox | Always missing from a drafted body unless you supply it |
| Clear opt-out mechanism | A clear way to opt out, plus a return address or internet-based method to do so | Often reduced to a vague “unsubscribe” word with no working mechanism described |
| 10-business-day opt-out honoring | Opt-out requests must be honored within 10 business days; the mechanism must work for at least 30 days after sending | An operational requirement, not a drafting one — still worth checking your tooling actually does this |
The pattern is consistent: an AI assistant is good at the parts of the email that are about persuasion, and silent on the parts that are purely compliance boilerplate, because nothing in a typical “write me a marketing email” prompt signals that those elements are required rather than optional style choices.
Before and after: the same draft, with compliance elements added
Before — a typical unprompted draft:
Subject: You’re going to want to see this
Hi [Name], we just dropped something big — 30% off everything this week only. Don’t miss out!
[Shop Now]
After — same offer, with the required elements present:
Subject: 30% off sitewide this week — [Brand] sale (Ad)
Hi [Name], this week only: 30% off everything storewide.
[Shop Now]
This is an advertisement from [Brand].
[Brand], 123 Example St, Suite 4, Springfield, IL 62701
Don’t want these emails? Unsubscribe here — requests are processed within 10 business days.
The subject line changed too, not just the footer — “You’re going to want to see this” doesn’t accurately reflect that it’s a 30%-off sale announcement, which is exactly the kind of mismatch the FTC guide’s truthful-subject-line requirement is aimed at.
A prompt addendum that forces the compliance elements in
Rather than remembering to manually add these elements after every draft, append this to any marketing-email prompt so the assistant includes them by default:
“This is a commercial email subject to the US CAN-SPAM Act. Include: a subject line that accurately describes the content (no misleading teasers), a clear statement that this is an advertisement, a footer with the placeholder [COMPANY NAME, STREET ADDRESS], and an unsubscribe line. Don’t remove these even if they make the email feel less polished — I’ll adjust the wording myself.”
The last sentence matters: without it, a model optimizing for a clean, persuasive email will sometimes trim the compliance footer back out in a later revision pass because it reads as clutter against the rest of the copy.
What counts as a valid physical address for a remote or distributed team
A company with no single office still needs a real address in the footer, and the FTC guide is specific about what qualifies: “your current street address, a post office box you’ve registered with the U.S. Postal Service, or a private mailbox you’ve registered with a commercial mail receiving agency.” A founder’s home address works technically, but most teams prefer a registered PO box or a commercial mail-receiving agency box precisely so the public-facing footer doesn’t double as a home address — either option satisfies the requirement as long as it’s actually registered, not just a made-up-looking box number.
How much flexibility there is in the ad disclosure wording
The FTC guide requires that the message clearly discloses it’s an advertisement but, per the guide, allows flexibility in how that identification appears — it doesn’t mandate the literal word “Advertisement” in a specific font or position. In practice this means a short line like “This is a promotional email from [Brand]” in the body, or “(Ad)” appended to the subject line as in the example above, both satisfy the requirement, as long as it’s clear and not buried in fine print below several screens of content. What doesn’t satisfy it is an email that reads as personal or editorial correspondence with no disclosure anywhere, even if a disclosure exists somewhere deep in a linked terms page.
What CAN-SPAM does not require
Two common misconceptions are worth clearing up. First, CAN-SPAM does not require opt-in consent before you send a first commercial email — unlike GDPR or Canada’s anti-spam law, it’s an opt-out regime: you can email someone who hasn’t asked for it, as long as you honor their opt-out once they ask. Second, it’s not limited to bulk or “spam” in the colloquial sense — per the FTC guide, it applies to any commercial email, including a single message sent to one recipient, so “it’s just one email” isn’t an exemption.
Why a small drafting gap is a larger risk at list scale
Per the FTC’s guide, each separate email in violation of the CAN-SPAM Act is subject to penalties of up to $53,088 (the figure as adjusted in January 2024), and the guide is explicit that this applies per email, not per campaign. A single non-compliant template is not one violation — it’s one violation multiplied by every recipient it was sent to, which is exactly why catching a missing footer in review, before a send, matters more than catching it after. The guide also notes that more than one person can be held responsible for a violation, so this isn’t only the sender’s problem if marketing, legal, and whoever operates the sending tool never actually checked the same draft.
Checklist before sending an AI-drafted marketing email
- Does the subject line accurately describe what’s inside, with no bait-and-switch framing?
- Is there a clear, visible statement that this is an advertisement?
- Does the footer include a real physical address — not a placeholder left unfilled?
- Is there a working, clearly described way to opt out, not just the word “unsubscribe” with no mechanism behind it?
- Does your sending platform actually process opt-outs within 10 business days, and keep the opt-out link live for at least 30 days?
- If this is a win-back or re-engagement send to someone who’s gone quiet, does it still carry the same footer as any other commercial email — compliance doesn’t relax for lower-intent sends?
This applies across email types — a sales follow-up subject line, an win-back sequence, an onboarding email, or an upsell message are all commercial email under the same rules, even though only some of them feel like “marketing” in tone.
None of this replaces legal review of your actual email program — the FTC guide covers more ground than fits here, including rules for forwarded and sweepstakes-related email. Treat this checklist as what to verify in a draft before it goes to whoever owns compliance at your company, not as a substitute for them. If an AI assistant is generating a high volume of email variants for A/B testing or personalization, the practical move is to put these requirements in a template the variants inherit automatically, rather than re-checking each generated version by hand — that way a missing footer is a one-time fix to the template, not a recurring review burden on every new draft.
FAQ
Does CAN-SPAM apply to B2B emails, or only consumer marketing?
It applies to commercial email generally, which includes B2B outreach — the FTC guide doesn’t carve out an exception for business recipients. A cold sales email pitching a product to another company is still commercial email under the same rules as a consumer promotion.
What if the email is transactional, like an order confirmation or a password reset?
Transactional and relationship messages are treated differently under the FTC guide, with a narrower set of requirements, but the moment a transactional email also includes promotional content, the stricter commercial-email rules can apply to it. The safest approach is to keep purely transactional messages free of marketing content, and apply the full checklist above to anything that includes an offer, a promotion, or a call to purchase.
Photo: Shixart1985 / Wikimedia Commons (CC BY 2.0)
