If you want to turn off informational email messages or you don't want to receive any notifications, you'll find an answer in I don't want to receive email notifications article.
Email and Cerebro client notifications are only sent regarding tasks a user is Subscribed to.
There are three levels of notifications. Notification settings are inherited from the first upper level to the lower ones by default. If a lower level has custom settings, the settings of the upper level will be ignored. For example, if a user sets custom notification settings, then the notification settings for the Universe and Projects will not apply.
Notification levels:
Universe notification settings. Only Universe administrators can access these settings.
Main menu > Tools > Administrator;
Universe tab, Notifications tab to the right;
You can set up which notifications will be sent to your Universe's users.
2. Project notification settings. Only Universe administrators can access these settings.
Main menu > Tools > Administrator;
Projects tab, select the project from the list that you want to set up notifications for. On the right, select the Notifications tab;
You can set up which notifications will be sent to users for the chosen project.
3. User notification settings.
Main menu > Cerebro > My profile...;
In the My profile window, click the Notification settings... button;
In the Notification settings window, you can set up which notifications will be sent to your user.