diff --git a/wallace/module_invitationpolicy.py b/wallace/module_invitationpolicy.py
--- a/wallace/module_invitationpolicy.py
+++ b/wallace/module_invitationpolicy.py
@@ -1284,7 +1284,7 @@
     msg['From'] = Header(utils.str2unicode('%s' % orgname) if orgname else '')
     msg['From'].append("<%s>" % orgemail)
 
-    modules._sendmail(orgemail, receiving_user['mail'], msg.as_string())
+    success = modules._sendmail(orgemail, receiving_user['mail'], msg.as_string())
     log.debug(_("Sent update notification to %r: %r") % (receiving_user['mail'], success), level=8)
 
 def send_cancel_notification(object, receiving_user, deleted=False, sender=None, comment=None):
@@ -1346,7 +1346,7 @@
     msg['From'] = Header(utils.str2unicode('%s' % orgname) if orgname else '')
     msg['From'].append("<%s>" % orgemail)
 
-    modules._sendmail(orgemail, receiving_user['mail'], msg.as_string())
+    success = modules._sendmail(orgemail, receiving_user['mail'], msg.as_string())
     log.debug(_("Sent cancel notification to %r: %r") % (receiving_user['mail'], success), level=8)
 
 def is_auto_reply(user, sender_email, type):