A court ruling in an otherwise ho-hum obscenity case contains a new domain name registration wrinkle that US email marketers should be aware of:

…private [domain] registration for the purpose of concealing the actual registrant’s identity would constitute “material falsification”

This means if you send opt-out email (intentionally or not) and use common privacy-enhancing domain registration services that hide the domain owner’s identity, it might add up to criminal liability under the CAN-SPAM act.  If you’re mailing for a reputable brand, why hide it?  Provide a real business name, address, and telephone in your domain records.  It’s no more info than is available on your website, and it might keep you out of CAN-SPAM trouble.