Thread:Talk:Echo (Notifications)/Email notification defaults/reply

It's perfectly legal, and you did technically agree to this. It says in section 17 of the Terms of Use: "You agree that we may provide you with notices, including those regarding changes to the Terms of Use, by email, regular mail, or postings on Project websites." Those e-mails are "notices", and you received them "by email".

I agree that one e-mail per message is a bit much. It would be much better with at least some sort of rate-limiter, like only sending one message per page/per day.