A frequent worry among buyers is whether emailing a purchased list breaks the law. In the US, the relevant rule is the CAN-SPAM Act and it doesn’t ban cold email outright. Instead, it sets requirements you must follow. Here’s what the law asks of you and how to stay on the right side of it.
What CAN-SPAM Requires
CAN-SPAM is the US federal law governing commercial email. Rather than requiring prior permission to email someone, it sets standards for how commercial messages must be sent — covering honesty, identification, and the right to opt out. Compliance is about meeting those standards on every commercial message you send.
Does CAN-SPAM Ban Cold Email?
No. CAN-SPAM operates on an opt-out model, not an opt-in one, so it doesn’t prohibit sending unsolicited commercial email to people who haven’t agreed in advance. This is why cold email to a purchased list can be lawful under US rules — provided you follow the act’s requirements. Other countries, however, take a stricter opt-in approach.
The Core Rules for Commercial Email
CAN-SPAM’s main requirements include:
- Don’t use false or misleading header information — your “from” and routing details must be accurate.
- Don’t use deceptive subject lines.
- Identify the message as an advertisement where appropriate.
- Include a valid physical postal address.
- Provide a clear way to opt out, and honor opt-out requests promptly.
Meeting all of these on every commercial email is the heart of compliance.
Applying Them to Purchased Lists
The rules apply the same way whether you sourced contacts yourself or bought them. For a purchased list, that means being truthful about who you are, including your address, making opt-out easy, and removing anyone who opts out from future sends. The fact that the contacts were purchased doesn’t change your obligations.
How This Interacts With Other Laws
CAN-SPAM is US-specific and comparatively permissive. If you email people in other regions, stricter rules may apply — the EU and UK bring GDPR and national electronic-marketing rules into play, and Canada’s CASL generally requires consent. So a message that’s compliant under CAN-SPAM may not be compliant elsewhere. Always match your approach to where your recipients are.
Best Practices for Compliant Cold Email
Beyond the legal minimum, good practice protects both compliance and results: keep your sender information honest, send relevant messages to well-targeted recipients, make unsubscribing effortless, honor opt-outs immediately, and maintain a suppression list so you never re-contact someone who’s opted out. These habits keep you compliant and improve deliverability.
Key Takeaways
CAN-SPAM doesn’t ban cold email to purchased lists; it requires honesty, identification, a physical address, and an easy, honored opt-out. The rules apply regardless of how you sourced the contacts. But CAN-SPAM is US-only and permissive — stricter consent-based laws apply elsewhere, so tailor your approach to recipients’ locations and consult an attorney.
Frequently Asked Questions
Does CAN-SPAM allow cold email to purchased lists?
Yes. CAN-SPAM uses an opt-out model, so it doesn’t prohibit unsolicited commercial email, provided you follow its requirements. Stricter rules apply in some other countries.
What does CAN-SPAM require?
Accurate header information, non-deceptive subject lines, identifying ads where appropriate, a valid physical postal address, and a clear, promptly honored opt-out.
Do the rules differ for purchased contacts?
No. CAN-SPAM’s requirements apply the same way regardless of how you sourced the contacts. Being truthful, including your address, and honoring opt-outs are required either way.
Is cold email legal everywhere under CAN-SPAM?
No. CAN-SPAM is US-specific and permissive. Regions like the EU, UK, and Canada have stricter, often consent-based rules, so match your approach to where recipients are.
Does CAN-SPAM apply to B2B email as well as consumer email?
Yes. CAN-SPAM generally applies to commercial email messages regardless of whether the recipient is a consumer or a business contact. Organizations should ensure their outreach practices comply with the law’s requirements.
What happens if someone opts out of my emails?
Opt-out requests should be honored promptly and the recipient should be removed from future marketing communications as required. Maintaining accurate suppression lists is an important compliance practice.
Can I continue emailing someone after they unsubscribe?
Generally, marketing emails should stop once a valid opt-out request has been received. Organizations should have processes in place to ensure unsubscribe requests are respected.
Should I keep records of unsubscribe requests?
Yes. Maintaining records of opt-outs helps prevent accidental future outreach and demonstrates that your organization is taking compliance obligations seriously.
Can a compliant email still perform poorly?
Absolutely. Legal compliance and campaign effectiveness are different issues. An email can comply with applicable regulations and still generate poor results if the targeting, messaging, or data quality is weak.
How can I reduce risk when emailing purchased B2B contacts?
Use reputable data sources, validate contact information before sending, target relevant audiences, provide clear opt-out mechanisms, maintain suppression lists, and understand the rules that apply in each region where recipients are located. 
