Not really, I wanted to add a notification that may come up not even once a month (once every 6 month even) but when I saw the sign up I just closed the tab. But otherwise I'd have entered it.
i cant do this userless as i am pretty sure this is against several anti spam restrictions.
Something passive I don't even notice would be fine, although getting an email "hey we just created an account for you" would be quite jarring as well.
I guess... If you frame it like "here is a token to change your settings" it'd be alright.