I want to mass email all of my previous customers to my website, but wanted to figure out if I'm complying with CANSPAM and how to set this up so that I'm complying with it in the future. Can I just mass email them all, obviously having the unsubscribe link etc. without getting consent to email them? I've never had a Check box to receive emails from us in the future. I was thinking about just adding to the Terms of Service of the website and putting that, by purchasing any of our services, you agree to opt-in to our mailing list, which you can unsubscribe from at any time. I just want to know what I can do with all these previous customer emails and how I can do this the legit/legal way in the future. Thanks in advance!