No matter the role you have in a given project, you can customize when you receive email notifications. Upon joining a project, there are default notification settings, which you can find under the Project page. However, you can edit these settings at any time and personalize them for certain aspects of the project. For example, you can keep notifications on for when you are assigned an item within the project or turn notifications off when other people comment on a given item.
Each notification setting is broken up by activity type, your decision on whether to receive an email notification or not and a description of the activity type. You can toggle between notification settings for individual project activities including assigned items, comments, mentions, and new items. Of course, you can also turn all email notifications off if you so choose.