I'm looking for a detailed guide to CAN-SPAM compliance and best practices for opt-in. Does anyone have a favorite resource for keeping up to date with the latest regulations and guidelines? The FTC guide doesn't seem to have kept pace with the best practices as enforced by the ESPs, especially as it regards to opt-in practices. I ask because we are evaluating various ESPs and they all have asked for detailed descriptions of our opt-in process, I'd love to see some guidance as far as what they want to see from a best practices standpoint as we are overhauling our website and have the flexibility to create an optimized opt-in experience.