diff --git a/src/collective/task/browser/cancel_attribution.py b/src/collective/task/browser/cancel_attribution.py
index 5b9b7f2..fab3836 100644
--- a/src/collective/task/browser/cancel_attribution.py
+++ b/src/collective/task/browser/cancel_attribution.py
@@ -95,10 +95,7 @@ class CancelTaskAttribution(z3c.form.form.Form):
                     document.manage_delLocalRoles([responsible])
                 document.reindexObjectSecurity()
 
-                # remove relevant subtask
+                # remove relevant subtask (responsibles are notified by email with an Event)
                 self.context.manage_delObjects(subtask.id)
 
-                # notify responsible by mail it's removed
-                email_notification_of_canceled_subtask(subtask)
-
         self.request.response.redirect(find_nontask(self.context).absolute_url())
diff --git a/src/collective/task/browser/cancel_information.py b/src/collective/task/browser/cancel_information.py
index 5e78cdc..107f74f 100644
--- a/src/collective/task/browser/cancel_information.py
+++ b/src/collective/task/browser/cancel_information.py
@@ -82,8 +82,7 @@ class CancelInformation(z3c.form.form.Form):
                     self.context.manage_delLocalRoles([responsible_id])
                 self.context.reindexObjectSecurity()
 
-                email_notification_of_canceled_information(information)
-
+                # remove information (responsible is notified by email with an Event)
                 self.context.manage_delObjects(information.id)
 
         self.request.response.redirect(self.context.absolute_url())