Dustin Spicuzza
--- a/app/views/groups/_group_admin_settings.html.haml
+++ b/app/views/groups/_group_admin_settings.html.haml
        %br/
        %span.descr This setting can be overridden in each project.

+.form-group.row
+  = f.label :emails_enabled, 'Email Notifications', class: 'col-form-label col-sm-2'
+  .col-sm-10
+    .form-check
+      = f.check_box :emails_enabled, class: 'form-check-input'
+      = f.label :emails_enabled, class: 'form-check-label' do
+        %strong
+          Allow projects within this group to send email notifications
--- a/app/views/groups/_group_admin_settings.html.haml
+++ b/app/views/groups/_group_admin_settings.html.haml
        %br/
        %span.descr This setting can be overridden in each project.

+.form-group.row
+  = f.label :emails_enabled, 'Email Notifications', class: 'col-form-label col-sm-2'
+  .col-sm-10
+    .form-check
+      = f.check_box :emails_enabled, class: 'form-check-input'
+      = f.label :emails_enabled, class: 'form-check-label' do
+        %strong
+          Allow projects within this group to send email notifications
+        %br/
+        %span.descr If disabled, this cannot be overridden by individual projects.
+
--- a/app/models/namespace.rb
+++ b/app/models/namespace.rb
    Gitlab.config.lfs.enabled
  end

+  def emails_enabled?
--- a/lib/api/entities.rb
+++ b/lib/api/entities.rb
      expose :only_allow_merge_if_pipeline_succeeds
      expose :request_access_enabled
      expose :only_allow_merge_if_all_discussions_are_resolved
+      expose :emails_enabled
--- a/app/controllers/groups_controller.rb
+++ b/app/controllers/groups_controller.rb
      :avatar,
      :description,
      :lfs_enabled,
+      :emails_enabled,
--- a/app/controllers/projects_controller.rb
+++ b/app/controllers/projects_controller.rb
      :container_registry_enabled,
      :default_branch,
      :description,
+      :emails_enabled,
--- a/changelogs/unreleased/disable-notification-emails.yml 0 → 100644
+++ b/changelogs/unreleased/disable-notification-emails.yml 0 → 100644
+---
+title: Allow project administrator to disable email notifications for all users of
+  a group or project
+merge_request:
--- a/db/migrate/20180724095501_add_email_enabled.rb 0 → 100644
+++ b/db/migrate/20180724095501_add_email_enabled.rb 0 → 100644
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddEmailEnabled < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_column_with_default :projects, :emails_enabled, :boolean, default: true, allow_null: false