To enable/disable e-mail notifications, all you have to do is access your user settings by clicking on your username on the upper right corner of the screen:
Then, click on the 'Notifications'-tab to open the notifications settings:
By checking (or unchecking your settings checkboxes) you can choose to receive e-mail notifications when:
- Someone adds you to a Pipe or Organisation or mentions/assigns you to a Card;
- A card is moved between phases, becomes expired, late or overdue;
- A new comment or checklist is created.
You can define your notification settings as default to all your pipes (if you want to receive the same notifications for all your pipes) or you can define custom values for each pipe. It's important, though, to always click the green save button after modifying each pipe's notification's settings.