CAN-SPAM Compliance for Small Business Email Marketing: A Plain-English Guide
If you send marketing emails to US customers, the CAN-SPAM Act applies to you — regardless of your business size. Here’s what it actually requires, in plain English, and the fines for getting it wrong.
Quick Answer
CAN-SPAM requires every commercial email to: use accurate “From” and subject line information, clearly identify the message as an advertisement, include your business’s valid physical postal address, provide a clear and easy way to opt out, and honor opt-out requests within 10 business days. Violations can carry penalties of tens of thousands of dollars per email, so this is worth getting right even for a small list.
This is general information, not legal advice — for compliance specific to your business, consult an attorney familiar with email marketing law.
The Core Requirements
- Accurate header information. Your “From,” “To,” and routing information must accurately identify the sender — no misleading domain names or spoofed addresses.
- Non-deceptive subject lines. The subject must reflect the actual content of the email — “Your order has shipped” on a promotional email is a violation.
- Clear identification as an ad. Commercial emails need to be identifiable as advertising, though this can be done conversationally rather than with a blunt “ADVERTISEMENT” label.
- A valid physical postal address. Every commercial email needs your business’s real street address, a registered PO box, or a commercial mail receiving agency address.
- A working opt-out mechanism. Recipients need a clear, easy way to unsubscribe — and it has to keep working for at least 30 days after the email is sent.
- Honoring opt-outs within 10 business days. Once someone unsubscribes, you can’t charge a fee, require personal information beyond an email address, or make them jump through hoops to stop receiving emails.
- Monitoring what others do on your behalf. If you use an affiliate or a marketing agency to send emails for you, you’re still legally responsible for their compliance.
What Most Small Businesses Get Wrong
The most common violations aren’t intentional spam — they’re small oversights: an email footer missing a real street address, an unsubscribe link that’s broken or takes multiple steps, or a “From” name that doesn’t match the actual sending domain. Most email marketing platforms (Mailchimp, Klaviyo, ConvertKit) handle the technical compliance pieces automatically if you fill in your business address in the account settings — the gap is usually a business owner never having set that field at all.
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- Does your email footer include a real, valid postal address?
- Is your unsubscribe link visible, working, and processed within 10 business days?
- Does your “From” name and email address match your actual business?
- Would your subject line accurately describe the email to someone who hasn’t opened it?
- If you use a third-party sender or agency, have you confirmed they’re compliant too?
Good email deliverability starts with proper domain setup — if you haven’t configured SPF, DKIM, and DMARC yet, see How to Set Up Professional Business Email With Google Workspace. And if you also market to EU customers by email, GDPR consent rules layer on top of CAN-SPAM — covered in GDPR-Compliant WordPress Websites.
Frequently Asked Questions
Yes — CAN-SPAM applies to any commercial email, including messages to existing customers, not just cold outreach. Purely transactional emails (like order confirmations) have different, lighter requirements, but marketing content sent to any list needs full compliance.
Penalties are assessed per individual email in violation, not per campaign, and can add up quickly for a large list. The FTC periodically adjusts the maximum penalty amount — check the FTC’s current guidance for the exact current figure.
You don’t have to use your home address directly — a registered PO box or a commercial mail receiving agency address satisfies the requirement while keeping your home address private.
Most major platforms handle the unsubscribe mechanism and footer address field for you, but only if you’ve actually filled in your business address in the account settings — that step is manual and often skipped.
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