BrassFrog's dashboard

I'm not receiving e-mails when someone starts following me I notice my follower count increase but there's no e-mail announcing that I have a new follower. I have chacked that myn e-mail address is correct and that the box is checked to receive notification.

I've recently gotten several new followers but never received a notification e-mail for the last few. These users have in common that they follow THOUSANDS of other people.