- Ensure opt-out mechanisms are operational for at least 30 days post-send.
- Include an unsubscribe link in the header or footer of emails.

Can Spam Requirements:
- Accurately identify the sender in the header information.
- Use a subject line that accurately represents the content of the email.
- Identify the message as an advertisement, unless you have express consent (opt-in) from the subscriber.
- Include your physical mailing address.
- Provide a mechanism to opt out. You cannot require a subscriber to log in or visit more than a single page to unsubscribe.
- Honor opt-out requests promptly. You must process an unsubscribe request within 10 days, and your unsubscribe mechanism must be operational for at least 30 days after the mailing.

Answers are: A D