Originally Posted by josefaryan
If you've not stated/mentioned that your members are going to receive marketing communications from you at the time of their registration into your website, then you're not allowed to send communications to them (messages other than your website/service related are not good to send and may be considered as spam).
I'd like to clarify this statement just a bit for the OP's benefit.
It doesn't matter what the information is, if the person didn't opt in for email from you then don't send them email and that includes website communications. For example, when you registered here you were asked to opt in for email notifications from the site admins. I think that's what you were saying Jose
Also, if we are talking about CAN-SPAM, it's not a case of it not being allowed...it's a case of it not being a good idea. CAN-SPAM allows you to do all sorts of things which you just shouldn't do. Keep in mind, that it's the ISPs and ESPs who guard the inbox and they will be the first to respond to user complaints and not the legislation in question.