Hello I have gathered email addresses of 200 people that I want to send emails to. In the email, I would try to sell them a service. I am not very familiar with ICANN rules. Can I legally send these emails in the US? What do I need to do to make it legal? If I put a note at the end, saying "if you do not wish to receive any more emails, reply to this email with the subject line unsubscribe", would that make it legal? I realize I could read the ICANN rules, but i thought i would ask someone with first hand experience.