Should send to notification_email instead, feedback:

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/6342#note_17146325

app/services/notification_service.rb

@@ -321,7 +321,7 @@ class NotificationService
       pipeline,
       pipeline.project,
       nil, # The acting user, who won't be added to recipients
-      action: pipeline.status).map(&:email)
+      action: pipeline.status).map(&:notification_email)
     mailer.public_send(email_template, pipeline, recipients).deliver_later
   end

spec/models/project_services/pipeline_email_service_spec.rb

@@ -58,7 +58,7 @@ describe PipelinesEmailService do
     end
     it 'sends email' do
-      should_only_email(double(email: recipient), kind: :bcc)
+      should_only_email(double(notification_email: recipient), kind: :bcc)
     end
   end