The CAN-SPAM Act is the United States law that sets the rules for commercial email. It does not require opt-in consent, but it does require honest headers and subject lines, a valid physical postal address, and a clear, working way to unsubscribe that is honored promptly.
What CAN-SPAM requires
In short: don't use false or misleading sender and subject information, identify the message as an ad where relevant, include your physical address, offer a visible opt-out, and process unsubscribes within 10 business days. Mailpro adds a compliant unsubscribe link and honors it automatically through unsubscribe management.
CAN-SPAM vs GDPR
CAN-SPAM (US) is opt-out based, while GDPR (EU) requires opt-in consent — if you email across regions, follow the stricter rule. Read more on email compliance. Related: suppression list and spammer.
Mailpro and compliance
Stay compliant, automatically
Mailpro adds a working unsubscribe to every campaign and suppresses opt-outs across your lists — compliant by default.