I don’t think the E-Mail notification system works correctly. I think that if someone wants to receive Notification of replies it should only send one E-Mail out even if there are 10 replies. And also if someone was watching a post and decide to turn E-Mail notification off all together, they should not receive any more E-Mail.
The way the notification system works not. If a new user has E-Mail notification turned on and makes a post he will receive every reply in his E-Mail box. If he goes in to his profile and turns off E-Mail notification and another 10 people reply to his first topic. He will get another 10 E-Mails saying he has a reply. Not only dose this make users mad but it’s a waste of bandwidth.