Remove email notifications of cancelled tasks

[EasySite]

Hi,

I've managed to get rid of some of the email notifications by going into PWA
Homepage on each individual resources and unticking the checkboxes in "Alert
me about my tasks and status reports".

The only emails I want to receive now is when resources update the
actual/remaining work on their timesheet. How do you get rid of emails when a
task has been cancelled and when tasks have been substitute to another
resource?

Thanks