diff --git a/app/models/learning_object.rb b/app/models/learning_object.rb
index f5784c753c897d6bab98608faccc5cbbe93d3e8b..d47b733e0e2c92e8453294fdb55f361c41644ac8 100644
--- a/app/models/learning_object.rb
+++ b/app/models/learning_object.rb
@@ -48,10 +48,9 @@ class LearningObject < ApplicationRecord
   # *current_user* destroy learning object
   include Trackable
 
-
   has_paper_trail
 
-  has_many :collection_items, as: :collectionable
+  has_many :collection_items, as: :collectionable, dependent: :destroy
   has_many :collections, through: :collection_items
   has_many :attachments, class_name: 'LearningObject::Attachment', autosave: true # autosave to allow import
 
diff --git a/config/initializers/devise.rb b/config/initializers/devise.rb
index 22bd678d1197e263ba5c871982a33be0d06a1802..7a19e1847ac269e51b7433fa87ab2e73f2ea9008 100644
--- a/config/initializers/devise.rb
+++ b/config/initializers/devise.rb
@@ -12,7 +12,7 @@ Devise.setup do |config|
   # Configure the e-mail address which will be shown in Devise::Mailer,
   # note that it will be overwritten if you use your own mailer class
   # with default "from" parameter.
-  config.mailer_sender = 'suporte@c3sl.ufpr.br'
+  config.mailer_sender = 'portalmec_tec@c3sl.ufpr.br'
 
   # Configure the class responsible to send e-mails.
   # config.mailer = 'Devise::Mailer'