Today I started receiving email notifications about various ticket activities.

I'd like to customize the types of activities I want to be notified about and how.
For example, I'm not really interested in seeing a task move through its statuses.
But it would be useful to receive notifications when the task is completed. Similar to a resolution in JIRA.
I'm also interested in receiving notifications about comments. But it would be nice to be able to customize how I receive them. On the website itself or by email.