What is the CAN-SPAM Act? A Clear Guide

CAN-SPAM is the US law governing commercial email. It requires accurate headers and subject lines, a physical postal address, a clear opt-out honored within 10 business days, and identification of the message as an ad. Fines reach over $50,000 per email.

Why it matters

Getting the CAN-SPAM Act right keeps you compliant and lands more mail in the inbox. See the deliverability checklist.

How Rainmail helps

Rainmail sends from your own domain on a dedicated, isolated IP with SPF, DKIM, DMARC, reverse-DNS and managed warm-up handled for you, plus an AI watching list health and deliverability — and it welcomes senders SES, SendGrid and Mailchimp reject, from $8. Run the free checker or see plans.