The CAN - SPAM Act does not ban sending commercial emails but imposes laws on using wrong or sending deceptive mails which are false and misleading.
This act states that the person who is sending a commercial e-mail should not misguide or misinform the recipient over the content or source of the mail. Also, the recipient has the right to reject the e-mail and the sender must include name and address at the end of the mail.
Providing an option to let the receiver unsubscribe easily is required. If a person requests you to unsubscribe them from the mailing list, that should be done in a timely manner. Violation of these rules attracts penalty.