My typical Phabricator workflow is based around notifications. I turned off all Phab emails at the Email Preferences page (phabricator.corp.[mycompany].com/settings/panel/emailpreferences/), and throughout the day I check for notifications to act on. I still get emails for Diffusion comments (i.e., audits) because there aren't any email settings for Diffusion on the Email Preferences page -- seems like that page only supports settings for Differential and Maniphest.
Are there plans to add email prefs for Diffusion?