Compliance & regulatory
CAN-SPAM Act
US federal law regulating commercial email.
CAN-SPAM (2003) is the US law governing commercial email. Requires: accurate 'from' lines, non-deceptive subject lines, identification as an ad, a physical postal address, and a working unsubscribe link honored within 10 business days. Per-violation penalty up to $51,744. Affiliate operators using email need to comply on every send; the CRM platform doesn't insulate you.
Example
Affiliate's nutra-promo email landed a $40k FTC fine — missing physical address in footer + a list rented from a non-compliant source. The platform was Sendgrid; the liability was the affiliate's.