Please note: you must be an admin to change settings for your organization.
By default, all users will be notified about new posts that are created in the Team (and all subsequent activity on the post as well).
If you are finding that users are receiving too many notifications, you can change this default notification behavior.
Specifically, you have the ability to turn OFF this team-level notification setting. You can do this by editing your Team Settings. When you uncheck this box, all users in this Team will no longer be automatically notified about new Posts going forward.
For more on how post notifications work in ZERO, please click here.
Here's how to change the team setting:

3. Uncheck the box next to Subscribe all team members to new posts.
4. Be sure to select "Update team" before navigating away from the dialog box.