I am using vbulletin 4.1.5. It has an option that if i start a thread , then i am auto subscribed to it and when someone replies to it , i will be sent an instant email notification to my mail stating that someone has replied to my thread. I have did the settings , but subscription emails are not being sent. everything else like forgot password , registration email are being sent. But no subscription emails are being sent to the users mailbox. what could be the reason , i am heavily frustrated , please help ...