CAN-SPAM Compliance Checklist for B2B Email Marketers

CAN-SPAM is the US federal law governing commercial email, and it applies to B2B marketing emails just as much as consumer ones, a point that surprises some B2B marketers who assume the law is mainly aimed at consumer spam. The requirements themselves are fairly short and mechanical, which makes them straightforward to check against, provided you actually know the full list.

This is a practical compliance checklist, not legal advice, and any business with specific compliance concerns should consult an attorney. What follows covers the core, well-established requirements every commercial email needs to meet under CAN-SPAM.

1. What CAN-SPAM Actually Requires

At a high level, CAN-SPAM requires that commercial email not use deceptive header or subject line information, that it clearly identify itself as an advertisement where applicable, that it include the sender's valid physical postal address, that it provide a clear way to opt out of future email, and that opt-out requests get honored within 10 business days. None of these requirements are complicated individually, but missing even one creates real compliance exposure.

2. Accurate Header and From Information

The "From," "To," and routing information in a commercial email must accurately identify the person or business that initiated the message. Using a from-address or display name designed to mislead the recipient about who's actually sending the email is a direct violation, regardless of whether the email content itself is otherwise compliant.

3. Non-Deceptive Subject Lines

A subject line can't misrepresent what the email actually contains. A subject line implying a personal reply to an earlier conversation that never happened, or a subject designed to look like an internal company notice when it's actually a sales pitch, crosses into deceptive territory even if the body of the email is otherwise fine.

A CAN-SPAM compliance review is largely mechanical: checking headers, subject lines, disclosures, and opt-out handling against a fixed list of requirements.

4. Advertisement Disclosure

Commercial email needs to be identifiable as an advertisement, though the law gives some flexibility in exactly how this is conveyed, through the subject line, a clear statement in the body, or context that makes the commercial nature evident. A standard disclosure line, something like "This is a promotional email," is a straightforward way to satisfy this requirement without ambiguity.

5. Valid Physical Address

Every commercial email must include a valid physical postal address for the sender, which can be a street address, a registered P.O. box, or a commercially registered mailbox obtained under USPS regulations. This requirement exists regardless of company size and is one of the most commonly overlooked elements in smaller B2B marketing operations.

6. Opt-Out Mechanism

Every commercial email needs a clear, working way for the recipient to opt out of future messages, most commonly an unsubscribe link, and this mechanism has to keep working for at least 30 days after the email is sent. It also can't require the recipient to do anything more burdensome than reply or click a single link and, where applicable, visit a single web page to submit the opt-out, and it cannot require a fee or any information beyond an email address.

7. Honoring Opt-Outs Within 10 Days

Once a recipient opts out, the sender has 10 business days to stop sending commercial email to that address, and can't sell, transfer, or otherwise pass that address to a third party once the opt-out request is received, except in limited circumstances tied to compliance itself. Maintaining a reliable, promptly-updated suppression list is the practical mechanism most senders use to meet this requirement consistently across every campaign.

8. Does CAN-SPAM Apply to B2B Email

Yes. CAN-SPAM applies to any commercial email with a primary purpose of advertising or promoting a product or service, regardless of whether the recipient is a business or a consumer, and regardless of whether the relationship is B2B or B2C. There's no blanket exemption for business-to-business marketing email under the statute, which is why B2B senders need to meet the same core requirements as any consumer-facing email program.